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Bosses and Extremis
Six Extremis bosses sit on the mission tables: Norn Emissary, Ghazghkull, the Great Unclean One, Vizzik Skour, Trugg, and Skarbrand. The final bosses are Mortarion on Perils of the Warp and Nagash on Necropolis. Each final opens after three Extremis kills.
| Boss | Faction | Type | Notes | Status |
|---|---|---|---|---|
| Norn Emissary | Tyranids | Extremis | Weak to Gauntlets of Ultramar. October 2026 demo Extremis boss; the surrounding Synapse brood matters as much as the boss itself. | 3 sources |
| Ghazghkull Mag Uruk Thraka | Orks | Extremis | Weak to Bale Eye. The Waaagh! spawns and buffs Boyz; Makari is an official hint but his role is unconfirmed. | 3 sources |
| Great Unclean One | Death Guard | Extremis | Weak to Weapon of the Matriarch. Named on the Steam page and in the official FAQ; exact move list unpublished. | 3 sources |
| Vizzik Skour, Prophet of the Horned Rat | Skaven | Extremis | Weak to Aqshian Firestakes. Screen-filling Skaven boss; Bell of Doom and Globadier poison complicate the arena. | 3 sources |
| Trugg the Troggoth King | Gloomspite Gitz | Extremis | Weak to Zangrom-Thaz. Ironshell Club telegraphs and an arcane keystone that fires Burning/Poisoned/Bleeding projectiles. | 3 sources |
| Skarbrand | Blades of Khorne | Extremis | Weak to Uskavar the Sunderer. Exact phase rules unpublished. | 3 sources |
| Mortarion, Daemon Primarch of Nurgle | Death Guard | Final boss | Warhammer 40,000 final boss; the mission unlocks after defeating the three Extremis bosses. | 3 sources |
| Nagash, Supreme Lord of the Undead | Death | Final boss | Age of Sigmar final boss; the mission unlocks after defeating the three Extremis bosses. | 3 sources |
| Carnifex | Tyranids | Elite | Achievement target; the achievement text does not state a stage or boss role. | 3 sources |
| Typhus | Death Guard | Elite | Achievement target; the achievement text does not state a stage or boss role. | 3 sources |
| Grukk Face-Rippa | Orks | Elite | Achievement target; the achievement text does not state a stage or boss role. | 3 sources |
| Mangler Squigs | Gloomspite Gitz | Elite | Achievement requires defeating a pair; Yndrasta unlocks by defeating one on Gnarlwood. | 3 sources |
| Plague Furnace | Skaven | Elite | Achievement target; the achievement text does not state a stage or boss role. | 3 sources |
| Skull Cannon | Chaos | Elite | Achievement requires defeating a pair. | 3 sources |
Counters, not health bars
Published bane tags: Bale Eye for Ghazghkull, Weapon of the Matriarch for the Great Unclean One, Gauntlets of Ultramar for the Norn Emissary, Aqshian Firestakes for Vizzik Skour, Zangrom-Thaz for Trugg, and Uskavar for Skarbrand. Flintlock's result name is disputed, so the Vizzik tag uses the atma.gg spelling and the evolution page keeps the other name beside it.
A Field Guide note says any guide that prints exact boss hit points is not trustworthy, because those numbers are not public. This page has no phase chart and no enrage timer. The practical advice that is written down is generic: clear a pocket, keep the boss in the overlap of your strongest attacks, and strafe instead of backing up in a straight line.
Six elites are achievement targets rather than Extremis: Carnifex, Typhus, Grukk Face-Rippa, Mangler Squigs, Plague Furnace, and Skull Cannon. The final-boss search is the Mortarion and Nagash pair, not a third secret name.
Questions
Who is the final boss?
Mortarion for 40K, on Perils of the Warp. Nagash for Age of Sigmar, on Necropolis. Both ask for three Extremis kills first.
How do you kill an Extremis boss?
Use the published counter weapon if you have it, clear adds, and move sideways. Exact health is not published.
Sources
- Field Guide bosses — checked 2026-11-12
- atma.gg missions — checked 2026-11-12
- atma.gg evolution databook — checked 2026-11-12