Bane DMG: Skeleton

Assuming that it is a "bane" skill in the traditional sense of an RPG, I would appreciate any information anyone can provide about the particulars of each of these skills. I am guessing it is an anti-skill which negates a mob, much like a cleric's natural ability to counter the undead.

If anybody has any information on this, please pass it along. Many thanks!

--Pusbag Infection