[Autumn]

Frostbite already belongs to Yukionna, a more useful status for Cryser is probably Celcius, also it ties in with the name somewhat better.

Ice Armor is a very good skill but I feel as if it might as well be a passive, given how long it lasts, also I believe the summoner needs to have him installed to gain this anyway.

Snowfall is something I can agree with here, it lasts too little for the snow crow itself, given a summoner can just use it passively and get the talent that extends tile duration.