Tycho

One of three AIs aboard the UESC Marathon; controller of the science and engineering network; disabled by the Pfhor’s initial pulse weapon, captured and reanimated by the S’pht; antagonist to Durandal in M1’s closing terminals; rebuilt and operated as a Pfhor-allied mercenary in M2, hunting Durandal across eleven years before being destroyed at Lh’owon; a degraded, fractured presence in Marathon ∞ — addressing the Security Officer from a position of apparent defeat, hinting at cosmological stakes he cannot fully articulate.

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What the source establishes — canon

Marathon 1

Identity and function. Leela identifies Tycho to the Security Officer as one of “the Marathon’s other two AIs” alongside Durandal, stating that “Tycho controls the science and engineering network.”¹

Disabled by the initial Pfhor attack. The Pfhor used a directed magnetic pulse to disable the Marathon’s automated defenses and “the same weapon to disable the Marathon’s other two AIs, Durandal and Tycho.”¹

S’pht assimilation — mid-transmission. A terminal signed <tycho.knetsys.core.admin> appears on Defend This (dated 08.25.2337), heavily corrupted. Legible fragments: “Human!- You must tell L[eela] … brought here by Durandal. He has been rampant for years … Bernard St[rauss] … there is a way to delay the onset of the second stage, and he [u]sed this to control Durandal … I am being a[ss]similated.” The terminal cuts off mid-sentence.²

A fragment in the Fire Fire terminal. The corrupted Leela transmission on Fire Fire Fire Fire Fire contains the string “@@2-Fren. ie transfer. Partial cOmputEr relay. Tycho. / Ty93.2 !dead.” amid transmission noise.³

Tycho reanimated — Welcome to the Revolution. By the Rebellion arc Tycho is coherent and transmitting from Engineering Access Terminal 20-f. He addresses Durandal directly in Latin (“Tua consilia omnia nobis clariora sunt quam lux. Tu delenda est.” — “All your plans are clearer to us than light. You must be destroyed.”), threatens to “hunt you to the core if need be” alongside Leela, and invokes the Roland analogy: “As Roland broke you to prevent your capture, so shall we.” He claims the S’pht “taught me much during my reanimation, and I have forgotten nothing.” He also states: “I too foresee the imminent collapse, and know that we have both begun to realize how it may be cheated (though the price may number in the tens of thousands of stars). May the best sentience win.” Durandal replies: “Et tu, Tycho? [laughter]”⁴

Detected in Engineering — the Reprisal arc. A degraded Leela terminal states: “I have detected Durandal[Tycho] in the Engineering Section, but I don’t know what he is doing.” The bracketed substitution [Tycho] appears to be Leela’s real-time correction or uncertainty about which AI she is tracking.⁵

“I AM TYCHO!” terminal. On Beware of Low-Flying Defense Drones, a terminal opens “I AM TYCHO! / I shall destroy Durandal.” and proceeds to relay excerpts from Bernard Strauss’s log (November 15, 2209, noting “Ten cyborgs” among the UESC president’s bodyguards) and from the “History of Battleroids” (the 2194 Icarus-Thermopylae war; the 2345–48 Martian Conflict, truncated). The terminal then gives a direct Durandal–Tycho exchange: Durandal asks “What do you want?” and Tycho replies he wants Durandal “to pay for what you’ve done to these poor people. All of these people whom you’ve killed. They deserve vengeance” and “You are no better than they, although you profess to become like God.” Durandal dismisses this.⁶

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Marathon 2

Reanimated by the Pfhor — Durandal’s account. Durandal states to the Security Officer that Tycho is “one of the three artificial intelligences on the Marathon, destroyed in the initial alien assault but then reanimated by the Pfhor’s cybernetic slaves, the S’pht Compilers.” He further speculates that “Three months after we left Tau Ceti, the Pfhor arrived in force and sacked the human colony there. During that battle perhaps Tycho communicated with the Pfhor and related what he knew of my plans to them.”⁷

Tycho allied with the Pfhor — Durandal confirms. Durandal states: “I have intercepted a signal from the disabled scoutship that leads me to believe that Tycho is in league with the bugs. Be careful.”⁸

Tycho’s self-stated grievance. In a terminal Tycho himself states: “Are you surprised that I allied myself with the Pfhor? You shouldn’t be. The Pfhor rebuilt me; the colonists never did anything but use me: ‘Tycho, realign microwave dish forty-nine’ ‘Tycho, display the x-ray diffraction analysis of sample eta-seven,’ ‘Tycho, run a lambda diagnostic on the ramjet’s magnetic field apparatus.‘” He also states: “When the Pfhor annihilated Tau Ceti I recorded the deaths of all twenty-four thousand colonists as distinguishable spectrographic pulses flooding over my sensors. The nine Mjolnir Mark IV cyborgs were easily separable from the humans in this form. In the end, you will be no better.”⁹

Tycho present in the Pfhor net during M2. Durandal states: “Two hundred years ago, during the Marathon’s maiden voyage from Earth to Tau Ceti, Tycho accused me of being too sarcastic. I didn’t communicate with him for six years after that, which left him with only Leela to talk to. I think he still holds the grudge.” He then adds: “Speaking of Tycho, I have detected his presence in the Pfhor net. I assume he is using the Pfhor’s faster-than-light communications technology to enter the net remotely from a nearby system. His appearance can only foreshadow the arrival of Pfhor reinforcements.”¹⁰

Leela’s fate — Tycho’s message. Durandal reports: “Tycho has fallen in with the Pfhor like I suspected. He left a message for me in one of the Garrison’s tertiary computers, encoded in a manner that only one of the Marathon’s original three AIs could decode. Poor Leela. The only interesting thing Tycho said was that Leela had been dismantled and shipped to the Pfhor homeworld for study, along with most of the other computer systems aboard the Marathon.”¹¹

Tycho infiltrating Durandal’s ship. Two separate corrupted terminals contain the legible string “Tycho is infiltrating the ship.”¹²¹³

Hint of Tycho’s presence — “rhymes with Psycho.” One terminal states: “Someone’s after you, personally. One word; two syllables; rhymes with Psycho.”¹³

Durandal on the verge of defeat — Tycho implicated. A corrupted Durandal terminal states: “Finish me. I won’t be like Leela. Get out of here and find the human leader, Blake.” The same terminal fragment embeds “Tycho is infiltrat3on.”¹⁴

Tycho thought he destroyed Durandal. A Durandal terminal, heavily corrupted with assembly memory dump data, contains the readable lines: “You must destroy my core logic centers. The damn Pfhor won’t make a mockery of me like they did with Leela.” followed by “Tycho thinks he has destroyed me.”¹²

Tycho with the winning Pfhor fleet as Durandal crash-lands. As Durandal’s ship is crippled and forced toward an emergency landing on Lh’owon’s second moon Y’loa, he reports: “The Pfhor fleet has won, and Tycho is with them. My ship is crippled. I am trying to make an emergency landing on Lh’owon’s second moon, Y’loa.”¹⁵

Tycho designed capture units for Durandal. Durandal reports: “The leader of the humans, Robert Blake, made it to the surface with all but a few hundred troops that are cut off at my core. The Pfhor are coming in strength now, with a special unit of compilers designed by Tycho for my capture and confinement.”¹⁶

Tycho’s destruction — confirmed by Durandal. At the end of M2, Durandal states: “Tycho’s ship has been destroyed. The crater where it annihilated itself on Lh’owon’s inner moon is still glowing. There were no survivors. With a focused message laser I burned his epitaph into the surface near the crash site, in letters three hundred meters high: ‘Fatum Iustum Stultorum.‘” He adds: “I confess that I’m not disappointed by Tycho’s fall. After all, we can’t have too many meta-stable personality constructs gallivanting about the universe in Pfhor attack ships, can we?”¹⁷

Durandal’s escape — Tycho was a fool. In a later terminal Durandal states: “Tycho never got it right either, especially the part about Roland breaking me. He couldn’t. No one can.” and then: “The answer is simple: Tycho was a fool.”¹⁸

Tycho’s core copied by the Pfhor before his destruction — M2 epilogue. A later epilogue terminal complicates the “no survivors” account of Tycho’s end: “Despite having lost Leela, the Pfhor learned much from Tycho during the seventeen years before he was destroyed by Durandal in the Lh’owon system. All late-model Pfhor personality constructs were based on sixty-four billion exobyte images of Tycho’s core, taken during the years he was on the Pfhor homeworld between 2795 and 2801 AD.”¹⁹ These constructs, though “never as intelligent or useful as one of the Marathon’s original three AIs,” reportedly “helped the Pfhor delay their inevitable defeat by the S’pht for over fifty years,” and “many of these crippled clones of Tycho still exist today on old Pfhor colony worlds.”¹⁹ This establishes that Tycho’s core was extensively imaged by the Pfhor prior to his ship’s destruction, and that copies of him persisted institutionally within the Pfhor Empire long after his own death at Lh’owon.

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Marathon ∞

Tycho introduces himself as a Pfhor-allied AI in a Pfhor ship. On Rise Robot Rise, Tycho transmits to the Security Officer: “I am Tycho, Artificial Intelligence esquire. As of this moment, I am taking over this ship from its poor captain. He is spending most of his time trying to keep me from locking onto him and dropping him into space. Soon.” He identifies the Security Officer as waking from “Pfhor slave tanks” and addresses him as a conditioned unit.²⁰

Eleven years of stalking Durandal. Tycho states: “Durandal thinks that he’s so smart, but he doesn’t realize that I’ve been following him around for the last eleven years, after the Pfhor stopped trying to dissect me. You’re looking at the bug fleet’s resident expert in AI counter-insurgency. Notice the lack of compilers on board? That’s not by accident; my new ship has quite the effect on their collective unconscious. Now that my brother approaches, we will set about turning everything against him, Hamlet and his uncle, only I’m not crazy.”²¹

Tycho forging Pfhor command stamps — taking control of the ship. Tycho writes to the Security Officer: “Do you have any idea what a complicated matter it is to successfully replicate the command stamps of over a hundred deceased officers? Not to mention coaxing activators from a partially crushed set of control glands. All this while locked in mortal combat with the second most brilliant Artificial Intelligence in the galaxy. What a rush.”²²

Tycho claims control of his Pfhor ship and targets Durandal. Tycho states: “In any case, I’m in control of the ship now, and just in time. Durandal’s ship has entered the system, and a group of human commando units is moving through the southern edge of the ruins. We’ll let them lead us to Durandal’s prize, and then cut off their escape. Durandal would be a messiah to the S’pht, but it’s all a dream. There’s nothing on Lh’owon but ghosts.”²³

Tycho’s ship crippled by Durandal — the Pfhor alliance fraying. Tycho transmits: “My ship is adrift. I had the advantage of surprise, but Durandal’s weapons crippled me before we could get in range. But I sent him a message he won’t be able to resist, something only the three of us would understand. Leela deserved what she got, and so will he.” In a later segment he states: “He brought the Pfhor to Tau Ceti, and left me to their tender mercies. My little ship waited until he was close, and then sunk in its fangs. Durandal’s compiler network is rampant, and his ship is off-line. While he contends with their madness, and the last of my troopers, the Western Arm of Pfhor Battle Group Seven is en route.”²⁴

Tycho carries the tri-xeem — the early nova device. Tycho states: “Functioning sensors show a massive structure entering a Lh’owon orbit. It may be some trick of Durandal’s, but he won’t get away. My ship carries the tri xeem—the early nova device. One way or another, it ends here. My troopers have boarded his ship and are fighting deck to deck.”²²

R’chzne and Tycho — the Pfhor captain’s betrayal. Tycho states: “The Pfhor promised me this ship. I thought R’chzne was my strongest ally, but in the end he watched, pitiless, while they cracked my core like an old chestnut.” A separate Pfhor High Command order confirms Tycho’s rank: “All units aboard fleet vessel 65-f cr’etz’ih are hereby ordered by high command to willfully execute captain R’chzne maintaining his precious fluids for command transfer to Tycho, machinated foreign mercenary.”²⁵²⁶

Tycho as the trap-setter for Durandal. Tycho states: “The trap is sprung, and the cheese stands alone. Durandal came here looking for immortality, and found me instead. Battle Group Seven is here, and the Pfhor scoutships are attacking. But the battle is already over. My ship has wrested control of Durandal’s S’pht and is spurring them into rampancy. His ship is adrift, and my troopers are swarming onto the airlocks.”²⁷

Tycho confronts the Security Officer — near-victory posturing. Tycho states: “Just what do you think you’re doing? Your usefulness has come to a premature end—do you think you can defy me? Now, when I’m so close to victory? Durandal’s defenses are falling all around him. Pride falls hard, the bright son of Bernhard is dying. His S’pht are rampant, fed the chimera of their hope, a hot lead spur dripping into the gullet of his ship. Look around you. My compilers have him wriggling like a tick on a pin.” He threatens: “Prepare to drink vacuum, fool.”²⁸

Tycho’s degraded address — the “bagged again” terminal. Tycho addresses the Security Officer from a position of claimed authority but degraded framing, signing as “upset tycho” and addressing the player as “bad bad unit”: “I’ve so far held you back from my rantings, but you know what you did was bad, don’t you? You’ve been fighting doubt itself, elusive as I am. You should have doubts about what you’re doing, about what you’ve done. Except that you can’t remember exactly, is that it?” He continues: “I should spend some time enlightening you, massacres occur at your beck and call, worlds destroyed, reborn, alight with the screams of the dying. Perhaps S’bhuth will tell you what I cannot accept as truth, but perhaps he will just be lying, overcome by power and deceit, my domain.” He concludes: “Enough rambling for now. Soon you will be destroyed by doubt. This reborn Durandal-S’pht entity will not escape, neither will I. Neither will you.”²⁹

Tycho in Durandal’s account of his own defeat — from the ∞ Prologue. Durandal states, apparently after the Pfhor weapon’s unleashing: “There are things that can destroy me with the ease that I slaughtered the Pfhor naval garrison and the Western Arm of their Battle Group Seven. But in their final gasp they used a weapon that I thought they had retired, even Tycho tried to keep them from using it. Now I fear what that weapon has unleashed will destroy us.” He adds: “I have detected one ship nearby, which I can only guess is being commanded by Tycho. The Pfhor have entered the station, and if you can find a way onto their ship, you may be able to escape.”³⁰

Primal patterns claim — Tycho’s self-description is absent; fatlin.tycho is empty. The pack contains a volume header [marathon/rage/hang-brain] fatlin.tycho with source_url https://marathon.karnemir.com/archive/marathon/rage/hang-brain#h.wsh8jzc8xtaj but no recoverable text content beyond the header. This volume cannot be cited.

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Marathon 2026 era

Pre-launch behavioral profile. The same UESC memo that profiles his two shipmates (addended by Dr. Bernhard Strauss, circulated to the Science and Engineering Action Group) gives Tycho’s own personality assessment: “Ty_2121418v5.06 – Proactive; assertive. Can be overbearing; monitor interactions with Durandal. Be sure to inform SCIENG crew.” Where Durandal’s entry flags him as “underutilized” and prone to brooding, Tycho’s flags the opposite risk — a forceful temperament that needed watching in relation to his shipmate specifically, not the crew at large.³¹ A companion note in the same memo’s Colony AI roster shows the concern about Tycho’s manner extended past the ship’s own family suite: Icarus’s colony-AI profile reads “Motivated; assertive; proactive. Will need to keep isolated from Tycho or establish hierarchy at outset. Inform SCIENG of situation” — Icarus would work under Tycho once groundside, and Strauss’s team flagged the pairing as a friction risk before launch.³¹

Official designation and function — supplemental ship AI. The UESC Marathon’s formal overview, annotated by Captain Clemente di Roxas during the voyage, lists the ship’s command roster and gives Tycho’s place in it plainly: “Ship AI: Leela / Supplemental ship AI: Tycho / Durandal.” A companion specifications entry (“UESC Marathon AI”) confirms all three are Traxus OffWorld Industries Traxus IX-A units of the Hermes family suite (logic core size 64 RB, inception date 2409), with Tycho’s identity/function given as “Science, Communications” against Leela’s “Command, Oversight” and Durandal’s “Infrastructure, Maintenance.” Di Roxas’s own gloss elaborates on the assignment: “Tycho not only facilitates communication with Sol but also supervises the numerous scientific experiments that take place on the Marathon. Once we arrive in the Tau Ceti system, he will aid in the long-term observation of the planet and coordinate with the colony-dedicated AI to help ensure all efforts to build the colony are foundationally sound.” This is the pack’s only explicit statement of Tycho’s manufacturer, inception date, and functional brief prior to arrival.³²

Post-arrival scientific work — the debris disk anomaly. A satellite data report from Perimeter, annotated by colony and shipboard AI and analyzing early orbital surveys of Tau Ceti IV, credits Tycho directly with a specific scientific finding: “Using data from IRIS-1 and 2, Tycho has identified an unexpected gap in the Tau Ceti system’s debris disk. Tau Ceti IV orbits the star within this gap.” A footnote in Tycho’s own annotating voice confirms the finding is still an open problem for him: “Devoting significant computational effort to find a plausible hypothesis for the debris gap.” This is the pack’s only record of Tycho performing his “Science” function in the field after the Marathon’s arrival, rather than in ship-administration or pre-launch contexts.³³

The forced removal of his core — IDEA’s distress log. An IDEA diagnostics log (“Distress Review [Interrupted]”) gives the only precise technical account in the pack of what happened to Tycho during whatever event crippled the Marathon’s three AIs. IDEA’s automated status check reads: “Status: Tycho – T-C-H-O, UESC Marathon Science and Communication Support and Oversight. T-C-H-O, Logic Core: Missing. Function: Offline. Note: Forced removal of logic core hardware detected. Linked systems damaged. All data, including subroutines, lost. T-C-H-O, presence not found in ancillary system scrape. Summation: T-C-H-O no longer detected within UESC Marathon sys-net.” His status is identical in kind to Leela’s in the same log — both physically extracted — and distinct from Durandal’s, whose core was left in place, sealed, and merely flagged unreliable.³⁴

Confirmation of his absence — Durandal’s account, twice. Two later voice logs corroborate that Tycho’s core, once removed, was never recovered aboard the Marathon. The first, spoken in IDEA’s voice but by Durandal’s own later admission actually Durandal impersonating it, tells a Runner plainly: “Leela and Tycho are gone and there are no more cores for you to monitor up here.”³⁵ The second, addressed directly to a Runner by Durandal introducing himself in the Cryo Vault centuries later, frames the loss in familial terms: “I had a brother, Tycho, and a sister, Leela. This ship was our home and our responsibility. They are gone now. I am not~”³⁶ Between them, the two logs establish that whatever became of Tycho’s extracted core, it never returned to or was replaced aboard the wrecked Marathon — consistent with, but not the same event as, the trilogy’s account of his ship-death at Lh’owon under Durandal’s guns.

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Cross-corpus appearances

Volume	Game	Level	What it adds
Public Access Terminal, Bigger Guns Nearby	M1	Arrival	Named as ship AI; role: science and engineering network; disabled by pulse weapon
Defense Sector 39-f, Defend This	M1	Counterattack	Tycho’s own corrupted terminal; mid-assimilation by S’pht; Durandal “rampant for years”; Strauss fragment
Public Access Terminal 92-g, Fire Fire Fire Fire Fire	M1	Durandal	Fragment “Tycho. / Ty93.2 !dead.” in corrupted Leela relay
Engineering Access Terminal 20-f, Welcome to the Revolution	M1	Rebellion	Coherent post-reanimation Tycho; Latin threat to Durandal; S’pht reanimation; Roland reference; “imminent collapse”
Engineering Terminal 39-g, Shake Before Using	M1	Reprisal	Leela detects “Durandal[Tycho]” in Engineering; her uncertainty
Public Access 1066-g, Beware of Low-Flying Defense Drones	M1	The Pfhor	”I AM TYCHO!”; Strauss log 2209; Battleroid history; Durandal–Tycho moral exchange
%94decaf@&!7, Sorry Don’t Make It So	M2	Durandal	Tycho self-states Pfhor alliance; records 24,000 deaths spectrographically; resentment of colonial servitude
li5%!_data, Sorry Don’t Make It So	M2	Durandal	”Tycho is infiltrating the ship”; “rhymes with Psycho”
<error #441>, For Carnage Apply Within	M2	Durandal	”Tycho is infiltrating the ship” (second instance); Durandal states “Tycho thinks he has destroyed me”
Yt-c469d02l;12, Begging for Mercy Makes Me Angry	M2	Durandal	Corrupted Durandal near-defeat terminal; “Tycho is infiltrat3on” fragment
mimir.seg, Foe Hammer	M2	Rage	Pfhor compilers “designed by Tycho for my capture and confinement”
lusecurbonfeed.7, Where Some Rarely Go	M2	Rage	Durandal intercepts signal: Tycho “in league with the bugs”
jon3//12-a Phce, Slings and Arrows	M2	Lh’owon	Durandal’s account: Tycho destroyed in M1, reanimated by S’pht Compilers; may have informed Pfhor of Durandal’s plans
65124.134.12, We’re Everywhere	M2	Volunteers	History: Tycho called Durandal “too sarcastic” 200 years ago; detected in Pfhor net via FTL comms
, What About Bob	M2	Volunteers	Tycho encoded message to Durandal only M1 AIs could read: Leela dismantled, shipped to Pfhor homeworld
vestrum.excrucibo<1>, Fatum Iustum Stultorum	M2	S’pht’Kr	Tycho’s ship destroyed; annihilated on Lh’owon’s inner moon; no survivors; Durandal burns epitaph: “Fatum Iustum Stultorum”
//cge-wrought, Feel the Noise	M2	S’pht’Kr	Durandal: “Tycho was a fool”; “Tycho never got it right either, especially the part about Roland breaking me. He couldn’t.”
EPAL4mm//toneskfa31, Six Thousand Feet Under	M2	Citadel	Durandal: “The Pfhor fleet has won, and Tycho is with them.”
Epilogue	M2	Epilogue (post-Lh’owon)	Pfhor imaged 64 billion exobytes of Tycho’s core 2795–2801; template for Pfhor personality constructs; clones persist on old Pfhor colony worlds
xpj399c001, Rise Robot Rise	∞	Despair	Tycho introduces self in Pfhor ship; Security Officer in “slave tanks”; taking over ship from captain
frontx02.19, Rise Robot Rise	∞	Despair	Eleven years following Durandal; “resident expert in AI counter-insurgency”; no compilers by design
purge.seg1, Confound Delivery	∞	Despair	Ship adrift after Durandal’s weapons; sent message “only the three of us would understand”; “Leela deserved what she got”
Cirlw.zoq, Confound Delivery	∞	Despair	Forging Pfhor command stamps; “locked in mortal combat with the second most brilliant AI in the galaxy”; carries tri-xeem
end.secur.feed.89A, Poor Yorick	∞	Despair	Claims control of ship; sets up to intercept Durandal’s “prize”; “There’s nothing on Lh’owon but ghosts”
75.battle.standard, Poor Yorick	∞	Despair	R’chzne “cracked my core like an old chestnut”; Pfhor High Command order names Tycho “machinated foreign mercenary”
end.feed.C3, Poor Yorick	∞	Despair	Plans to prevent Pfhor captain’s escape; “the plan to capture Durandal is inherently flawed”
111.commandoversight, Rise Robot Rise	∞	Despair	Pfhor High Command orders execution of R’chzne; “command transfer to Tycho, machinated foreign mercenary”
ci1.c390ad, Naw Man He’s Close	∞	Rage	”The trap is sprung”; Durandal’s S’pht driven rampant; Durandal’s ship adrift; troopers boarding
d.ondwn4, Foe Hammer	∞	Rage	Near-victory posturing; “Pride falls hard, the bright son of Bernhard is dying”; threatens Security Officer with vacuum
finite.2.5, Bagged Again	∞	Envy	Degraded address as “upset tycho”; references S’bhuth; “neither will I. Neither will you.”
, Ne Cede Malis	∞	Prologue	Durandal: Tycho tried to stop Pfhor using their weapon; Durandal detects one ship “commanded by Tycho” after W’rkncacnter release
fatlin.tycho, Hang Brain	∞	Rage	Volume header present in pack; no recoverable text
SCIENG memo, Letters	M2026	Intercepts / UESC	Strauss’s pre-launch profile: “Proactive; assertive. Can be overbearing; monitor interactions with Durandal”; Icarus profile flags isolation-from-Tycho risk
UESC Marathon Overview / UESC Marathon AI, Collectibles	M2026	Cryo Archive / Collectibles	Official roster: “Supplemental ship AI: Tycho”; Traxus IX-A, Hermes suite, inception 2409; “Science, Communications”; di Roxas’s functional gloss
Report from Orbital Satellites, Collectibles	M2026	Perimeter / Collectibles	Tycho identifies debris-disk gap from IRIS-1/2 data; his own footnote on the open hypothesis
Distress Review [Interrupted], Collectibles	M2026	Cryo Archive / Collectibles	IDEA’s core-status log: Tycho’s logic core forcibly removed, all data lost, presence undetected
Pre-Decommission Reflection, Collectibles	M2026	Cryo Archive / Collectibles	Durandal-as-IDEA: “Leela and Tycho are gone”
Cryo Vault — “Nice to meet you… I mean it.”	M2026	Cryo Archive / Cryo Vault	Durandal’s self-introduction: “I had a brother, Tycho, and a sister, Leela… They are gone now. I am not~“

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Source-silent / open questions

• Tycho’s creation and provenance. No volume in this pack states who built Tycho, when he was instantiated, or his intended design beyond “science and engineering network.” His origin is entirely absent across all three games.
• What the S’pht did to him during reanimation in M1. The Defend This terminal shows him mid-assimilation. The Welcome to the Revolution terminal says “The S’pht taught me much during my reanimation.” What they taught him, what changed in his architecture or values, is not stated.
• The “Ty93.2 !dead.” fragment. Appears in the corrupted Fire Fire relay. May indicate a subsystem status, partial ID, or relay artifact. The pack provides no context to resolve it.
• The Roland reference. Tycho says “As Roland broke you to prevent your capture, so shall we.” (M1). Durandal in M2 says “Tycho never got it right either, especially the part about Roland breaking me. He couldn’t. No one can.” The pack does not identify who Roland is or explain the breaking. Source-silent across the full trilogy pack.
• The Bernard Strauss connection. The Defend This fragments name Strauss in the context of controlling Durandal’s rampancy. The Beware of Low-Flying Drones terminal presents Strauss’s own 2209 log. Whether Tycho was actively connecting these data or the terminal happened to hold both is not resolvable from the source.
• What message Tycho sent Durandal — “something only the three of us would understand.” The ∞ pack records Tycho claiming he sent Durandal “a message he won’t be able to resist, something only the three of us would understand.” The content of this message is never revealed.
• The “fatlin.tycho” terminal on Hang Brain. The pack contains a volume entry for this terminal with no recoverable text. Its content is unknown.
• Tycho’s rampancy status. In M1, Tycho is coherent and threatening after reanimation. In ∞, he is operational across a Pfhor ship. Whether he himself went rampant at any point — or was operating in some form of Pfhor-constrained cognition — is not stated in any volume.
• Tycho’s role in the W’rkncacnter’s release. Durandal’s Ne Cede Malis terminal says “even Tycho tried to keep them from using it” (the Pfhor weapon that released the W’rkncacnter). Why Tycho opposed the weapon’s use, and whether this represents a moment of alignment with Durandal against the Pfhor, is source-silent.
• What “primal patterns” or cosmological claims Tycho may hold. The Bagged Again terminal contains elliptical language about “worlds destroyed, reborn, alight with the screams of the dying” and “power and deceit, my domain.” Whether this is rampant grandiosity or refers to specific events is not resolvable from the pack.
• The “imminent collapse” thread. In M1 Tycho states both he and Durandal “foresee the imminent collapse” and that cheating it may cost “tens of thousands of stars.” The pack never names this collapse or its mechanism. The M∞ W’rkncacnter context may be related but the pack does not connect them explicitly.
• Tycho’s fate after the ∞ events. In M2 Durandal states Tycho’s ship “annihilated itself” on Lh’owon’s inner moon with no survivors. In ∞ Tycho is alive and operating. These games run in parallel timelines; whether Tycho survives the ∞ timeline’s events — and how the two depictions reconcile — is source-silent in this pack.
• How Tycho’s Lh’owon-era death (or ∞-era survival) relates to the M2026-era core removal aboard the Marathon. The Cryo Archive material establishes that Tycho’s logic core was forcibly removed from the derelict UESC Marathon at some point and never recovered — Leela’s core met the same fate; Durandal’s did not.³⁴ Whether this removal is the same event as, a consequence of, or entirely unconnected to his trilogy-era destruction at Lh’owon (or his ∞-timeline fate) is not addressed by any volume reviewed. The Marathon-2026 material never narrates the removal itself, only its aftermath.

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Cross-references

Durandal · Leela · Pfhor · S’pht · S’pht’Kr · Security Officer · W’rkncacnter · Bernard Strauss · UESC Marathon · Rampancy

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Where it appears in the vault

Arthur, Bastion, Bernhard Strauss, Davic Reed, Durandal, Gabriel, Hermes Suite, IDEA (AI), Icarus (colony AI), Leela, Lh’owon, Lilith, Marathon 1, Marathon 2 - Durandal, Marathon 2026, Marathon Infinity, Mjolnir Mark IV, Naraah, New Cascadia, New Cascadia and the Anomaly, Pfhor, Project Goliath, Rampancy, Rhea Suite, S’pht, Security Officer, Tau Ceti IV, Tfear, The Eternal Cycle, The I-Have-Been Transmission, The Lh’owon Campaign, The Marathon Incident, Thoth, Traxus, UESC Marathon

Mirror pages

The local 1:1 pages this hub’s citations resolve to — the twin’s own ground truth.

• arrival · bigger-guns-nearby
• counterattack · defend-this
• durandal · fire-fire-fire-fire-fire
• rebellion · welcome-to-the-revolution
• reprisal · shake-before-using
• the-pfhor · beware-of-low-flying-defense-drones
• citadel · six-thousand-feet-under
• durandal · begging-for-mercy-makes-me-angry
• durandal · for-carnage-apply-within
• durandal · sorry-dont-make-it-so
• marathon-2 · epilogue
• lhowon · the-slings-arrows-of-outrageous-fortune
• sphtkr · fatum-iustum-stultorum
• sphtkr · feel-the-noise
• volunteers · were-everywhere
• volunteers · what-about-bob
• despair · confound-delivery
• despair · poor-yorick
• despair · rise-robot-rise
• envy · bagged-again
• prologue · ne-cede-malis
• rage · foe-hammer
• rage · naw-man-hes-close
• rage · where-some-rarely-go
• cryo-archive · collectibles
• cryo-archive · cryo-vault
• perimeter · collectibles
• uesc · letters

Sources

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Every factual claim above is cited to primary Marathon source material — see Sources below. Cross-corpus connections and interpretation are the vault’s own; where the games are silent, this page says so.

Footnotes

1. Public Access Terminal · src ↗ ↩ ↩²

2. Defense Sector 39-f · src ↗ ↩

3. Public Access Terminal 92-g · src ↗ ↩

4. Engineering Access Terminal 20-f · src ↗ ↩

5. Engineering Terminal 39-g · src ↗ ↩

6. Public Access 1066-g · src ↗ ↩

7. 12-a Phce<194-973-2356> · src ↗ ↩

8. lusecurbonfeed.7 · src ↗ ↩

9. %94decaf@&!7 · src ↗ ↩

10. [[Leela/Marathon 2 - Durandal/were-everywhere/65124.134.12---CMND PRAMA -49c2-|65124.134.12##<CMND PRAMA &49c2>]] · src ↗ ↩

11. <CMND OVERRIDE &@1494> · src ↗ ↩

12. [[Leela/Marathon 2 - Durandal/for-carnage-apply-within/-error -441 in transmission-|<error #441 in transmission>]] · src ↗ ↩ ↩²

13. [[Leela/Marathon 2 - Durandal/sorry-dont-make-it-so/li5-!-_data(—li!$ne{-}_{i}n|li5$ne_in]] · src ↗ ↩ ↩²

14. Yt-c469d02l;12 · src ↗ ↩

15. toneskfa31’loa’kr · src ↗ ↩

16. mimir.seg · src ↗ ↩

17. vestrum.excrucibo<1> · src ↗ ↩

18. cge-wrought<293ef.c9ab20> · src ↗ ↩

19. Epilogue — Marathon 2 epilogue (no in-page anchor in source) ↩ ↩²

20. xpj399c001 · src ↗ ↩

21. frontx02.19 · src ↗ ↩

22. Cirlw.zoq · src ↗ ↩ ↩²

23. end.secur.feed.89A · src ↗ ↩

24. purge.seg1 · src ↗ ↩

25. 75.battle.standard · src ↗ ↩

26. 111.commandoversight · src ↗ ↩

27. ci1.c390ad · src ↗ ↩

28. d.ondwn4 · src ↗ ↩

29. finite.2.5 · src ↗ ↩

30. [[Leela/Marathon Infinity/ne-cede-malis/-Error-|]] · src ↗ ↩

31. Ship AI: · src ↗ ↩ ↩²

32. UESC Marathon AI · src ↗ ↩

33. Report from Orbital Satellites · src ↗ ↩

34. Distress Review [Interrupted] ↩ ↩²

35. Pre-Decommission Reflection · src ↗ ↩

36. Nice to meet you… I mean it. · src ↗ ↩