75% damage loss sounds pretty harsh and feels to expensive for the benefits. I'm not sure if a purely supportive role would be really usefull. Heals are only needed if someone is wounded, at higher level so only at about third round and buffs like Fortify are to scarce usable, they have pretty tough cooldown.
I guess Icy Stare would be pretty pointless at current state, because the chance to freeze them is either 100% or 0%
