Warhammer : The Horus Heresy
GURPS 4th Edition

Warhammer : The Horus Heresy

The Great Crusade is dying.

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@Tone
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Versionv5
CreatedAug 9, 2026
UpdatedAug 26, 2026
THE AGE OF DARKNESS

The galaxy burns—and you are not the heroes history will remember.

The Great Crusade is collapsing. Brother turns against brother, entire Legions choose between loyalty and betrayal, and humanity’s greatest empire begins tearing itself apart from within.

Players enter the opening years of the Horus Heresy as Astartes, soldiers, Mechanicum adepts, remembrancers, and other survivors caught beneath the footsteps of legends. You may fight beside famous commanders, witness the fall of worlds, uncover treachery, earn promotion, resist corruption, or disappear among the countless dead.

Battles are large, active, and unforgiving. Allied and enemy forces continue fighting beyond the player characters, while armor, ammunition, injuries, positioning, equipment, and raw differences in power determine who survives. A mortal cannot casually defeat an Astartes, and an ordinary Legionary cannot overcome a Primarch through luck alone.

Your choices can save lives, destroy companies, alter local battles, and decide who remains loyal—but history will not stop for you. The war moves forward whether you are victorious, defeated, corrupted, or dead.

Glimpses
Author's note

**AUTHOR’S NOTE** This is an evolving, canon-focused Horus Heresy campaign built to follow the established timeline, characters, battles, and major events as faithfully as possible. Additional campaigns, factions, quests, locations, characters, rules, and improvements will be added through future updates as the project expands.

Inside the World

1,368 entries · 30 types

Characters
401 total
Armor
32 total
Campaigns
8 total
Creatures
102 total
Advantages
76 total
Adventuring Gears
0 total
Armor Pieces
0 total
Attachments
5 total
Augmentations
0 total
Campaign States
0 total
Factions
38 total
Chaos Gods
0 total
Equipment
26 total
Game Starts
8 total
Locations
192 total
Psychic Powers
122 total
Magic Items
56 total
Weapons
76 total
Vehicles
82 total
Gameplay Toolbox Entries
0 total
Game Master Instructions
0 total
Species
14 total
Armor 1s
4 total
Lore
93 total
GM Instructions
26 total
Mechanicum Teches
0 total
Quests
0 total
Rituals
6 total
Rules
1 total
Creature 1s
0 total