This article or section contains information derived from Co-op Missions, and should not be considered part of the official StarCraft storyline.
Serdath is a dark archon who commanded a legion of dark archons. In an alternate timeline where Zeratul survived the early stages of the End War, Serdath and his legions aided Zeratul against Amon and his forces.
Serdath appears as the leader of the summonable Legendary Legion for Zeratul in Co-op Missions, deploying alongside a number of dark archons. He is unlocked as an option at Level 7. While he and his forces cannot be directly commanded, they can be indirectly guided to target locations using the top bar. At Level 8, Serdath and his dark archons gain the Maelstrom ability.