Toxic Ancient

The most deadly of the Infested units, Toxic Ancients are constantly surrounded by a poisonous cloud that lingers for a short while even after one is slain. Just being close to them will induce poison damage (which bypasses a player's shields), making melee combat a very poor tactic against these Ancients; interestingly, their arm attacks do not poison players. Toxic Ancients can be identified by the bright green glow from their heads, as well as their black and green bodies.