Demonic Trooper

The Demonic Trooper is a new monster introduced in The Ancient Gods - Part Two, the second major campaign extension to Doom Eternal. They are the warrior cast of Immora defending it and it's denizens from external threats as they await the return of their leader Davoth. Despite wearing full armor they are extremely weak, only dying to a couple bullets from the Heavy Cannon and exploding upon death. They carry a rifle that appears to be alive and may be a form of minor demon. They always drop a little bit of assorted ammo upon killing. They are unique in the way that they cannot be chainsawed nor glory killed.

Codex
Immora's warrior caste defends the ancient city, keeping watch over the walls since the betrayal of their creator millennia ago. The imperial guard of Davoth remains an honored position amongst the citizens of Immora, wielding armor and weapons forged in the fires of hate and suffering. Their loyalty and devotion to Davoth is unwavering, having waited eons for the return of their rightful leader.