The Plague Legions are the mortal and daemonic servants of Nurgle, the Chaos God of disease and despair. They’re best known as the Death Guard, the Traitor Legion that turned to Chaos during the Horus Heresy, and they’ve been rotting their way through the galaxy ever since.
What the plague legions actually are
In the broadest sense, the Plague Legions are the forces that answer to Nurgle in the mortal realm. That means the Death Guard Legion first and foremost, plus the countless warbands, daemons, and corrupted mortals who’ve pledged themselves to the Plague God.
They’re not a single unified army. The Death Guard keep their old Legion structure, but many warbands operate independently, spreading Nurgle’s gifts wherever they go. Some are ancient veterans of the Long War, others are recent converts who’ve embraced decay as a path to power.
The Death Guard: Nurgle’s first legion
The Death Guard were the XIV Legion, originally from Barbarus. Their primarch, Mortarion, hated psykers and tyrants, but his defiance of the Emperor eventually led him into Nurgle’s embrace. During the Horus Heresy, the Legion was becalmed in the warp and plagued by a supernatural sickness. Mortarion made a pact with Nurgle to save his sons, and they were reborn as Plague Marines.
Since then, the Death Guard have been Nurgle’s most organised mortal followers. They’re tough, relentless, and utterly devoted to their god. Their armour is fused to their bodies, their flesh is bloated and rotting, and they feel no pain. They march through battlefields shrugging off wounds that would kill a normal Space Marine.
- Primarch: Mortarion, the Death Lord
- Legion number: XIV
- Homeworld: Barbarus (destroyed), now based in the Plague Planet
- Specialty: attrition warfare, biological and chemical weapons, resilience
How they fight
Plague Legions don’t rely on speed or finesse. They grind forward, absorbing punishment and letting their unnatural toughness wear down the enemy. Plague Marines are famously hard to kill, and their weapons often spread disease as much as they deal damage.
They’re supported by daemons of Nurgle, like Plaguebearers and Great Unclean Ones, and by mortal cultists who’ve been blessed with Nurgle’s rot. The result is a slow, inevitable advance that leaves nothing but corruption in its wake.
| Unit type | Role |
|---|---|
| Plague Marines | Durable infantry, close-range firepower |
| Poxwalkers | Cheap, expendable horde of infected mortals |
| Plagueburst Crawler | Heavy artillery, spreads plague munitions |
| Daemons of Nurgle | Support and melee punch, summoned or allied |
Why they matter in the setting
The Plague Legions represent one of the most iconic faces of Chaos. They’re a reminder that the Imperium’s enemies aren’t just raiders or heretics, but cosmic forces that can corrupt even the Emperor’s finest warriors.
They also show a different kind of threat: not fast and flashy, but slow and unstoppable. In a galaxy of constant war, the Plague Legions are the creeping death that never really goes away. They’ve appeared in every major conflict since the Heresy, and they’ll keep coming as long as Nurgle laughs.
Key facts
- The Plague Legions are the mortal and daemonic forces of Nurgle, Chaos God of disease.
- Their core is the Death Guard, the XIV Space Marine Legion led by Mortarion.
- They specialize in attrition warfare, resilience, and biological corruption.
- They’ve been active since the Horus Heresy and remain a major threat in the 41st millennium.
- Plague Marines are known for their extreme durability and immunity to pain.
FAQ
Are the Plague Legions and the Death Guard the same thing?
The Death Guard are the core of the Plague Legions, but the term also covers other Nurgle-worshipping warbands and daemonic allies. So they’re related, but not identical.
Who leads the Plague Legions?
Mortarion is the primarch of the Death Guard and the most prominent leader. However, many warbands operate independently under their own champions.
What makes Plague Marines so tough?
Their bodies are fused with their armour and blessed by Nurgle, making them unnaturally resilient. They can survive wounds that would kill a normal Space Marine and feel little pain.