Fireball and meteor should be overpower skills, devouring blaze should be an overpower passive, esu’s ferocity should be an overpower keystone, and searing heat should be about overpower damage. Meteor aspects would be better changed to overpower focused, and it might make the currently incredibly worthless fireball uniques actually useful.
I tried necro for a little bit up to the 50’s before I went back to finish my sorc and something I found rather intuitive about the necro is how skills are kind of “sorted” theres a status effect/cc group that applies DoTs and conditions like slows, stuns, etc. Bone skills are mostly if not all centered around critical hits and barrier. Lastly blood skills are all about overpower hits and fortify.
Its a very well laid out skill tree that offers strengths and weakness depending on how you want to approach the game (probably excluding bonespear) and I think its a missed opportunity that sorcerer could benefit from. Most ice skills innately apply conditions, lightning is critical focused and the burning skills cover DoT. Making FB and meteor have reliable overpower mechanics like necro blood skills would an incredible improvement overall.
Greater fireball could convert burning damage into a percentage of overpower damage, while destructive fireball could trigger guaranteed overpower hits after (n-casts) like blood lance. Meteor could work similar to paranormal bloodsurge, gaining guaranteed overpower after hitting so many enemies.
A side note I find it rather stupid that warmth is a healing passive not a mana regen passive like, do you even play D2?