User blog comment:Tridan V2/Crain, General of the Frostguard/@comment-24036535-20150122213858

First of all: Surpression on a normal ability, a targeted one no less, is not ok, surpressions are pretty exclusively reserved for ults.

Second: That ult, better damage reduction than Alistar's ult, plus CC immunity for the same duration as Olaf's (not sacrificing tanky stats either), he essentially becomes unstoppable and unkillable for five seconds at the cost of 5% of his life, and on only an 80 second cooldown at max rank, that's beyond overpowered.