Chaos serpent

Chaos serpent can refer to any one of three forms of the same monster:
 * D'Sparil's mount in Heretic, its first occurrence, and the strongest known form of the creature.
 * Green chaos serpent, a Hexen monster of the same form but serving as a minor enemy.
 * Brown chaos serpent, a poison-smoke-belching variation of the serpent which also appears in Hexen.