01Essay5 min read
The Thoas Campaign
A victory that changes the meaning of the world Guilliman hoped to recover.
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02Essay4 min read
The Ruins of Thoas
Architecture, buried weapons, and the difficulty of reading a lost civilisation.
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03Essay4 min read
Theoretical and Practical — Guilliman's Method of War
Reason as a discipline of revision, tested by Thoas and challenged at Calth.
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04Essay4 min read
The Twenty-Second Chapter and the Destroyers
Specialist pride, contested reform, and the cost of an annihilating victory.
Read story05Essay4 min read
Iasus and the Reforging of the Twenty-Second
An outsider takes command of a Chapter whose identity is under pressure.
Read story06Essay4 min read
Monarchia's Shadow over Thoas
The memory of a destroyed city shapes the wish to preserve another.
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07Essay4 min read
Erasure — What Thoas Revealed
The recovered past overturns a promise of preservation and leaves an uneasy question.
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08Essay5 min read
The Battle of Calth
Betrayal, strategic shock, resistance, and the survival that cannot restore a world.
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09Essay3 min read
Calth Before Ruin
A lived world and a gathering built for cooperation become the conditions of disaster.
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10Essay3 min read
The Betrayal Before the First Shot
The captured tender and the betrayed friendship reveal an attack already underway.
Read story11Essay3 min read
The Opening Catastrophe
How an orbital environment and its connected systems become instruments of harm.
Read story12Essay3 min read
Aeonid Thiel and the Tactical Blind Spot
A censured sergeant has considered the opponent his institution cannot yet admit.
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13Essay3 min read
Remus Ventanus and the Ground War
Local command, technical allies, and the discipline to make resistance useful.
Read story14Essay3 min read
Guilliman and Kor Phaeron
An ambition to corrupt creates an opening in a confrontation the primarch nearly loses.
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15Essay3 min read
The Ruinstorm
A local counterattack cannot undo the strategic isolation produced by the rising storm.
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16Essay3 min read
Calth Below — The Beginning of the Underworld War
The survivors enter shelter and an ongoing war; endurance replaces restoration.
Read story17Essay5 min read
Roboute Guilliman — From Thoas to Calth
Two novels. Two campaigns. A study of reason, blindness, command, and the memory of war.
Read story18Timeline
Arrival above Thoas
The fleet reaches the twilight belt of a tidally locked world.
Follow event19Timeline
A decision to preserve
Guilliman rejects an annihilating solution that would destroy the ruins and permanently damage the recovered world.
Follow event20Timeline
Iasus takes the Twenty-Second
Iasus is elevated over Hierax to lead the Twenty-Second.
Follow event21Timeline
The ruins become a strongpoint
Iasus maintains the chosen position against pressure for a different attack.
Follow event22Timeline
Sirras breaks the order
Sirras continues destructive fire after Iasus orders it stopped.
Follow event23Timeline
The concealed network is exposed
Collapses and the changing battle expose the extent of the subterranean military installation.
Follow event24Timeline
The Second Destroyers are authorised
Hierax’s inference about a weapons cache gives the specialist formation a specific role.
Follow event25Timeline
Ancient weapons change the final descent
The underground concentration of dangerous human ordnance changes the rules of combat.
Follow event26Timeline
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 event27Timeline
A conjunction on Calth
The Legions prepare for a joint operation, and the world’s ordinary routines continue around the muster.
Follow event28Timeline
The Campanile is seized before the count
The tender is captured and its crew murdered well before most participants recognise an attack.
Follow event29Timeline
Thiel waits for censure
The sergeant has considered combat between Space Marines and is marked for discipline.
Follow event30Timeline
Tchure murders Luciel
A meeting grounded in shared service becomes deliberate murder.
Follow event31Timeline
The orbital catastrophe begins
The Campanile accelerates through the orbital environment as part of a coordinated attack.
Follow event32Timeline
Defence systems become enemy weapons
The attackers use the planetary weapons grid against the system it was meant to defend.
Follow event33Timeline
Thiel builds a surviving chain of command
With effective command absent where he stands, Thiel gathers survivors and organises the defence.
Follow event34Timeline
Ventanus reconnects the ground resistance
Local secure communications and underground routes connect a fighting group with technical allies.
Follow event35Timeline
The guildhall becomes a decisive ground objective
Enemy pressure concentrates around the defenders and the technical effort.
Follow event36Timeline
Guilliman confronts Kor Phaeron
Warp power wounds the primarch, but Kor Phaeron’s wish to turn him creates an opening.
Follow event38Timeline
The Ruinstorm rises
Erebus regards the storm as the completion of the attack’s larger design.
Follow event39Timeline
The surviving fleet must leave
Guilliman watches the storm from the Samothrace and accepts the need to depart.
Follow event40Timeline
The survivors withdraw into the arcologies
Ventanus makes the movement below a necessity.
Follow event41Timeline
Resistance enters the Underworld War
The closing commitment and later epilogue frame the years of underground resistance.
Follow event42Character
Roboute Guilliman
A commander whose commitment to reason is repeatedly tested by what he has not understood.
Meet character43Character
Marius Gage
A connecting voice: loyal enough to serve, perceptive enough to question.
Meet character44Character
Eleon Iasus
The outsider asked to turn a contested appointment into effective command.
Meet character45Character
Hierax
A displaced senior captain whose specialist knowledge remains necessary.
Meet character46Character
Evido Banzor
A Chapter Master in the Thoas operation, also named in Calth’s Legion roster.
Meet character47Character
Aeonid Thiel
The censured sergeant who has imagined the opponent others exclude.
Meet character48Character
Remus Ventanus
A captain whose resistance gives scattered survivors a shared purpose.
Meet character49Character
Kiuz Selaton
The close support that helps turn a captain’s decisions into survival.
Meet character50Character
Kor Phaeron
An attacker whose desire for a personal triumph changes the confrontation.
Meet character51Character
Erebus
The perspective that measures Calth through a strategic ritual result.
Meet character52Character
Sorot Tchure
A brother’s friendship becomes the access required for deliberate murder.
Meet character54Character
Magos Tawren
Technical recovery makes the defenders’ resistance strategically useful.
Meet character55Character
Lyros Sydance
The anger of the betrayed confronts the need for a useful objective.
Meet character56Group dossier
Ultramarines / XIII Legion
Reason, command, and the institutions that must adapt when assumptions fail.
Explore group57Group dossier
Word Bearers / XVII Legion
Expected partners use proximity, infrastructure, and trust to prepare an atrocity.
Explore group58Group dossier
The Twenty-Second / Nemesis Chapter
A specialist formation whose inherited identity complicates an imposed reform.
Explore group59Group dossier
The Second Destroyers
Annihilating capability requires a judgment about what a victory must preserve.
Explore group60Group dossier
The Ork Power on Thoas
The present occupiers of a world whose ancient dangers were made by humans.
Explore group61Group dossier
Calth’s Surviving Defenders
An editorial grouping for the soldiers and technical allies rebuilding resistance.
Explore group62Group dossier
Gal Vorbak at Calth
The close ground fighting includes enemies whose altered violence changes the threat.
Explore group63Publication
Roboute Guilliman: Lord of Ultramar
David Annandale — the Thoas campaign, reform, heritage, and the uncomfortable work of reason.
Explore source64Publication
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 source