Enchantment. "You summon 1 spirit for every 2 members in your party. Each summoned spirit will have a level 5...13...15 and will absorb the next 10 damage from a random party member. All the summoned spirits die after taking such damage. Your Spawning Power and Communing attributes are boosted by +1 for 10...38...45 seconds. "
Similar to Aura of the Lich, but with some kind of 'protective' option.