Bosses & known encounters

Which encounters have achievement support?

The collected conditions ask players to defeat Typhus, a Carnifex, Grukk Face-Rippa, a Plague Furnace, a pair of Mangler Squigs, a pair of Skull Cannons, Great Unclean One, Ghazghkull Mag Uruk Thraka, Norn Emissary, Skarbrand, Vizzik Skour and Trugg the Troggoth King.

We group these as Boss or major-enemy encounters. The text alone does not prove they all belong to one identical in-game classification or appear under the same conditions.

What is known about Extremis objectives?

For the Emperor! asks for a Warhammer 40,000 Extremis Boss defeat with Purity Mode enabled. For Sigmar! asks the equivalent for Age of Sigmar. The store description also identifies Extremis Bosses as a challenge.

These sources establish the named objectives, not a complete Purity Mode guide, an unlock sequence or a universal Boss timer. Check the objective text in your version before assuming another player’s run meets the same condition.

Why might a Boss health bar seem locked?

In the Steam thread, iamdanthemanstan reports locked health on Norn Emissary and Great Unclean One. In the specific reply, Angry Canadian names different pairings for the two encounters: Gauntlets of Ultramar for Norn Emissary, and Weapon of the Matriarch for Great Unclean One. The latter is listed with Ardent Blade and maxed Tactical Rock.

These are that player’s encounter-specific suggestions, not our playtest or a developer-confirmed requirement. The 40K recipe chart marks both Codex Astartes and Tactical Rock as requiring their maximum level for these pairings. Matching ingredient notes do not independently demonstrate either Boss mechanic.

What did the launch hotfix change?

The 11 November v2.1.6 announcement says Plague Marine Boss variants and Meganobz were made less impervious. It also fixes missing hints after an Extremis defeat. The collected notes initially apply to Steam; other platforms were scheduled to receive them later.

Damage formulas, exact health scaling, immunity lists and guaranteed kill strategies are to be confirmed. We do not fill those gaps using a competitor’s unsourced encounter table.