User blog comment:Endless Exceptions/Custom New Item Ideas: Necklaces./@comment-195.195.131.181-20121010091020/@comment-3475363-20121010113617

Ok, I guess it wasn't clear enough. So let me explain:

Everytime you do a skill there is a chance (30%) that the ability you used only cost half. BUT everytime you do a skill there's a 3 second cooldown on your item. So you can spam as much as you want but only ONE SKILL in those 3 seconds has a 30% chance to cost half the mana.