Ophidian

From Doom Wiki

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. The Ophidian stops firing briefly between the purple shots and the fireball.

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

They first appear in The Storehouse.

Heretic monsters
D'Sparil | Disciple of D'Sparil | Fire Gargoyle | Gargoyle | Golem | Golem Ghost | Green Chaos Serpent | Iron Lich | Maulotaur | Nitrogolem | Nitrogolem Ghost | Ophidian | Sabreclaw | Undead Warrior | Undead Warrior Ghost | Weredragon