Ophidian

Ophidians are monsters from Heretic that resemble snakes and carry pointed staffs. When attacking, they fire a chain of three purple shots from their staff, pause, and then fire a red fireball. Ophidians sometimes drop a Flame Orb when killed. These particular Flame Orbs are worth 5 shots instead of the usual 1 shot. note that when they fire the red shot, they aim again, so dont stop moving once you've dodged the first three.

Some source ports refer to the Ophidian as "Snake" or "Serpent".