Chaos Mage Perks

Howdy all!

I was curious if any of you could point me in the direction as to how to spend my Deity Points as a Chaos mage. I have 31 right now and I was saving them for Purge (When your creatures extract a Core from a target, the target is killed). This seems like it would make farming cores a lot easier. Or should I spend them on something else?

Thanks!