Vulkin has the ability to deal 2 damage to anyone when placed. This includes enemies, allies and even the healthbar of both players. This makes vulkin the all-class version of Justice's Punishment (but with 2 damage instead of 3).
What makes this good is that it bypasses the taunt ability allowing you to injure or kill any monster as well as directly attack the healthbar of the opponent.
Especially useful in Justice.