Seeker (guard)

The Seekers were three named elite Horde guards in Undercity that patrolled the city. They could detect stealthed enemies and upon discovering one, would attack it, alerting the city to its presence. Their patrol was on a set route that took them throughout a majority of the city. They were replaced by the Dark Rangers that now patrol the Undercity.

They might have been Deathguards.