Man... cryo characters that can use the Blizzard Strayer set and have a critdmg ascension stat and weapon, have absolute insane stats.
I have 2-3 bad substats (def/HP%/Atk/def/def%) on every single piece and some 5* items that started with only 3 substats and if you play a freeze comp with them, you still get to have 100% crit and 240% critdmg.
And it's so easy as well. Just use Mona and you are set for freeze. and have a nice damge boost as well, on top of that, enemies barely do anything.