Inferius

Inferi are a fictional species featured in the Harry Potter series.

Description
Inferi are created by a wizard from a corpse, which the wizard can reanimated through a series of spells. The resulting creature has little will of its own but is extremely sturdy, as well as unconditionally obedient to its reanimator. They can only be destroyed using fire. Lord Voldemort created a large number of Inferi as guardians for some of his treasures as well as minions to attack Muggle towns.