Increases Damage vs. Mist Monsters by up to 42% based on the percentage of your missing health. In addition, taking damage has a 45% chance to conjure a Phantasm (targets a nearby enemy, dealing 62 base Energy damage in a 0.5 tile radius, 1.5 second cooldown)
Melee
Swamp knight would be the best commander cause you will take damage from the dungeon constantly and will activate your phantasm as well.