Turret

Turrets are ambient demons that first appear in Doom Eternal: The Ancient Gods, Part One.

Codex Entry
''Invented by the Hell Priest Deag Nilox centuries ago, Turrets contain imprisoned lesser demons that serve as stationary guards for their dark masters. Taking the form of a single unnatural eye and rising from their fellsteel containers to fire on any intruders nearby, Turrets defend the spaces around them and previously served as a direct visual link for their Hell Priest Creator. With Deag Nilox now dead by the Slayer's hand the Turrets are directionless, and persist as undying traps that lash out with bursts of energy at anything that comes near.''