01Essay5 min read
The Battle of Calth
Betrayal, strategic shock, resistance, and the survival that cannot restore a world.
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A guided library of stories, people and turning points. Begin with a defining event, follow a reading path, or search the connected records.
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A defining moment
One story opens the wider archive. Follow its people, consequences and sources from there.
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02Essay3 min read
The Ruinstorm
A local counterattack cannot undo the strategic isolation produced by the rising storm.
Read story03Character
Roboute Guilliman
A commander whose commitment to reason is repeatedly tested by what he has not understood.
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From Thoas to Calth
Move through the connected campaigns, characters and source publications already in the archive.
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01Essay5 min read
The Thoas Campaign
A victory that changes the meaning of the world Guilliman hoped to recover.
Read story02Timeline
Arrival above Thoas
The fleet reaches the twilight belt of a tidally locked world.
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03Character
Roboute Guilliman
A commander whose commitment to reason is repeatedly tested by what he has not understood.
Meet character04Group dossier
Ultramarines / XIII Legion
Reason, command, and the institutions that must adapt when assumptions fail.
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05Publication
Roboute Guilliman: Lord of Ultramar
David Annandale — the Thoas campaign, reform, heritage, and the uncomfortable work of reason.
Explore source06Essay4 min read
The Ruins of Thoas
Architecture, buried weapons, and the difficulty of reading a lost civilisation.
Read story07Timeline
A decision to preserve
Guilliman rejects an annihilating solution that would destroy the ruins and permanently damage the recovered world.
Follow event08Character
Marius Gage
A connecting voice: loyal enough to serve, perceptive enough to question.
Meet character
09Group dossier
Word Bearers / XVII Legion
Expected partners use proximity, infrastructure, and trust to prepare an atrocity.
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10Publication
Know No Fear: The Battle of Calth
Dan Abnett — a betrayal told through campaign phases, marks, and the survival of a world’s defenders.
Explore source11Essay4 min read
Theoretical and Practical — Guilliman's Method of War
Reason as a discipline of revision, tested by Thoas and challenged at Calth.
Read story12Timeline
Iasus takes the Twenty-Second
Iasus is elevated over Hierax to lead the Twenty-Second.
Follow event13Character
Eleon Iasus
The outsider asked to turn a contested appointment into effective command.
Meet character
14Group dossier
The Twenty-Second / Nemesis Chapter
A specialist formation whose inherited identity complicates an imposed reform.
Explore group15Essay4 min read
The Twenty-Second Chapter and the Destroyers
Specialist pride, contested reform, and the cost of an annihilating victory.
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01Essay4 min read
Iasus and the Reforging of the Twenty-Second
An outsider takes command of a Chapter whose identity is under pressure.
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Monarchia's Shadow over Thoas
The memory of a destroyed city shapes the wish to preserve another.
Read story03Essay4 min read
Erasure — What Thoas Revealed
The recovered past overturns a promise of preservation and leaves an uneasy question.
Read story04Essay5 min read
The Battle of Calth
Betrayal, strategic shock, resistance, and the survival that cannot restore a world.
Read story05Essay3 min read
Calth Before Ruin
A lived world and a gathering built for cooperation become the conditions of disaster.
Read story06Essay3 min read
The Betrayal Before the First Shot
The captured tender and the betrayed friendship reveal an attack already underway.
Read story07Essay3 min read
The Opening Catastrophe
How an orbital environment and its connected systems become instruments of harm.
Read story08Essay3 min read
Aeonid Thiel and the Tactical Blind Spot
A censured sergeant has considered the opponent his institution cannot yet admit.
Read story09Essay3 min read
Remus Ventanus and the Ground War
Local command, technical allies, and the discipline to make resistance useful.
Read story10Essay3 min read
Guilliman and Kor Phaeron
An ambition to corrupt creates an opening in a confrontation the primarch nearly loses.
Read story11Essay3 min read
The Ruinstorm
A local counterattack cannot undo the strategic isolation produced by the rising storm.
Read story12Essay3 min read
Calth Below — The Beginning of the Underworld War
The survivors enter shelter and an ongoing war; endurance replaces restoration.
Read story13Essay5 min read
Roboute Guilliman — From Thoas to Calth
Two novels. Two campaigns. A study of reason, blindness, command, and the memory of war.
Read story14Timeline
The ruins become a strongpoint
Iasus maintains the chosen position against pressure for a different attack.
Follow event15Timeline
Sirras breaks the order
Sirras continues destructive fire after Iasus orders it stopped.
Follow event16Timeline
The concealed network is exposed
Collapses and the changing battle expose the extent of the subterranean military installation.
Follow event17Timeline
The Second Destroyers are authorised
Hierax’s inference about a weapons cache gives the specialist formation a specific role.
Follow event18Timeline
Ancient weapons change the final descent
The underground concentration of dangerous human ordnance changes the rules of combat.
Follow event19Timeline
Erasure and the uneasy verdict
The cleared mural and the installation’s military character support a reading of internal war and human self-destruction.
Follow event20Timeline
A conjunction on Calth
The Legions prepare for a joint operation, and the world’s ordinary routines continue around the muster.
Follow event21Timeline
The Campanile is seized before the count
The tender is captured and its crew murdered well before most participants recognise an attack.
Follow event22Timeline
Thiel waits for censure
The sergeant has considered combat between Space Marines and is marked for discipline.
Follow event23Timeline
Tchure murders Luciel
A meeting grounded in shared service becomes deliberate murder.
Follow event24Timeline
The orbital catastrophe begins
The Campanile accelerates through the orbital environment as part of a coordinated attack.
Follow event25Timeline
Defence systems become enemy weapons
The attackers use the planetary weapons grid against the system it was meant to defend.
Follow event26Timeline
Thiel builds a surviving chain of command
With effective command absent where he stands, Thiel gathers survivors and organises the defence.
Follow event27Timeline
Ventanus reconnects the ground resistance
Local secure communications and underground routes connect a fighting group with technical allies.
Follow event28Timeline
The guildhall becomes a decisive ground objective
Enemy pressure concentrates around the defenders and the technical effort.
Follow event29Timeline
Guilliman confronts Kor Phaeron
Warp power wounds the primarch, but Kor Phaeron’s wish to turn him creates an opening.
Follow event31Timeline
The Ruinstorm rises
Erebus regards the storm as the completion of the attack’s larger design.
Follow event32Timeline
The surviving fleet must leave
Guilliman watches the storm from the Samothrace and accepts the need to depart.
Follow event33Timeline
The survivors withdraw into the arcologies
Ventanus makes the movement below a necessity.
Follow event34Timeline
Resistance enters the Underworld War
The closing commitment and later epilogue frame the years of underground resistance.
Follow event35Character
Hierax
A displaced senior captain whose specialist knowledge remains necessary.
Meet character36Character
Evido Banzor
A Chapter Master in the Thoas operation, also named in Calth’s Legion roster.
Meet character37Character
Aeonid Thiel
The censured sergeant who has imagined the opponent others exclude.
Meet character38Character
Remus Ventanus
A captain whose resistance gives scattered survivors a shared purpose.
Meet character39Character
Kiuz Selaton
The close support that helps turn a captain’s decisions into survival.
Meet character40Character
Kor Phaeron
An attacker whose desire for a personal triumph changes the confrontation.
Meet character41Character
Erebus
The perspective that measures Calth through a strategic ritual result.
Meet character42Character
Sorot Tchure
A brother’s friendship becomes the access required for deliberate murder.
Meet character44Character
Magos Tawren
Technical recovery makes the defenders’ resistance strategically useful.
Meet character45Character
Lyros Sydance
The anger of the betrayed confronts the need for a useful objective.
Meet character46Group dossier
The Second Destroyers
Annihilating capability requires a judgment about what a victory must preserve.
Explore group47Group dossier
The Ork Power on Thoas
The present occupiers of a world whose ancient dangers were made by humans.
Explore group48Group dossier
Calth’s Surviving Defenders
An editorial grouping for the soldiers and technical allies rebuilding resistance.
Explore group49Group dossier
Gal Vorbak at Calth
The close ground fighting includes enemies whose altered violence changes the threat.
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