Avenger is the the class-specific skill for the ranger of the Sylvan faction in Heroes of Might and Magic V. It gives the hero's creatures a 40% chance to inflict a critical hit upon a favored enemy, giving double damage to it, whenever that creature is attacked. The ranger must choose their favored enemies from the Avenger's Guild in a Sylvan town, and they must have killed two whole populations of that creature before choosing it. It also allows Rangers to gain these abilities: