​The mission in Space Marine 2, Bellum Sempiternus, where Acheran is supposed to follow and participate in the fight, simply doesn’t work. Acheran stands idle at the door, and after the battle, where we are supposed to regroup at the newly opened door, I proceed inside, and the NPCs follow me. However, Acheran remains stuck back there, preventing progress in the mission and leaving me unable to advance. Searching online, I’ve noticed that many people are experiencing this same unresolved issue.