I set them as marine faction but made the guy in the room with them completely blind until he is told to shoot one of the them, it worked, then magically they all became invincible to absolutely all damage. ![]()
Correction, looks like they can still die, but just don't most of the time, even when i unload all my ammo on them and have an NPC unload a shotgun on them at point blank range.
Fixed it but boy did that require some tweaking.