NERF GLACIAL INTO THE GROUND
There is no other way to balance glacial. They have abilities which freeze ON TOP OF attacks that freeze. 20 percent should be the 6 glacial bonus. 20 percent from 6 sources is a very high chance to PERMA STUN THE MAP. Add to that sejuani team freeze, ashe ult freeze, lysadra ult freeze to that and you don't ever get a chance to do anything. Not to mention the stuns last so freaking long too. The only thing wrong with glacial is volibear kinda sucks.