Cryomancer
Arcane
There is an instance/encounter where due to giving the player character name, would result in an enemy that can only be attacked by it. The enemy does not seem to be damaged by pet/summons/Eidolons (...)
If you try to blast enemies yes, but remember, you can just ice prison, sirroco, fear and so on. I suggest checking this thread :
[PFKM] UNFAIR run as a Thassilonian Necromancer - With videos.
https://rpgcodex.net/forums/threads/pfkm-unfair-run-as-a-thassilonian-necromancer-with-videos.140352A pure RP build and I did right in unfair which many people says that is unbeatable without the min maxing and I did fine as probably one of the weakest Wizards subclass.