A simple glacial change
Glacials right now are pretty frustrating to go up against. I've lost rounds early game simply because of a 1 star Braum permastunning my main carry.
A think a pretty simple solution would be to change it to something like:
Glacial : Glacials' basic attacks have a chance to stun their target for 1.5 seconds on-hit. After being stunned, a champion cannot be stunned for 0.5 seconds.
This keeps glacials in a good spot, they can still provide a lot of crowd control. And you might not think it's even enough of a change. But one thing I've noticed in a lot of my games is having a champion with a full mana bar never able to cast because they get perma stunned. This change would at least let them get their ability off before being stunned again.