Rat Callers are Beast monsters in Act V of Diablo III, mostly encountered in Repository of Bones and Plague Tunnels.
In-game[]
Rat Callers are average in size and strength, resembling large humanoid rodents (and very similar to Lacuni Warriors).
In combat, they move quickly and attack with their claws, and occasionally roar, calling 5-10 Plague Rats at their side from the ground below. The amount of rats each Caller may summon is not limited.