Space Marine 2 Patch 15

Space Marine 2’s Patch 15, the second-anniversary update, launches on 1 October 2026, bringing Chaos Siege, new endgame challenges, weapons and expanded customisation. Space Marine 2 Its headline addition is Chaos Siege, where players take control of Heretic Astartes and fight Tyranids, Imperial troops and loyalist Space Marines for control of Avarax. Crucible adds a different challenge: players select class-specific penalties called Penances, complete increasingly difficult trials and earn Crucible XP to unlock Lamenters armour for each class. Space Marine 2 Combat additions include a One-Handed Thunder Hammer for Tactical, Assault, Bulwark and Techmarine, plus three Heroic weapon variants: the Frost Axe, Power Maul and Iron Hands Auto Bolt Rifle. Tactical also receives a substantial skill-tree rework, with expanded melee choices that replace its primary weapon and a new perk allowing a Bolt Rifle in the secondary slot.