Rapida said:Negative Energy Overflow: The damage caused by the skulls is from all off the negative energy the skulls give off. It follows the same rules as swarm damage but causes the damage to be negative energy not physical damage. This also has the side effect of curing undead if in the same square as them.
Damage Reduction 10//Magic and Adamantine
I'm sure you have some kind of devious ideal for a power this monster can have.