Glacial is busted, needs small nerfs
How is Glacial not the most busted thing? Sej and Voli alone are two incredibly strong units (Voli being one of the best units in the game), but Glacial buff is stupid OP. It is not very fun losing because 3-4 of your units are perma-stunned the entire round. Sej + Voli + Ashe is seriously frustrating because even if your backline doesn't get stunned by Glacial, Ashe is constantly bombarding it with her ults. Plus Glacial has really tanky units and good synergies with Guardian, Knight, and Brawler all of which make them ridiculously hard to kill. 3 item Voli not only melts most units but is super tanky and he has Glacial buff.
I don't think Glacial needs to be changed all that much to make it less over-powered tbh. I think if there was a small Cooldown before a unit could be frozen again it would solve them being the most frustrating class to fight against. Alternatively you could change Glacial away from stunning and into lower Attack Speed, but I'm not sure if that would make them useless or not.
EDIT: Or the 4 Glacial option could be removed and just have it go from 3 to 6 like some of the other classes.