A7-ChaosSorcerer VS I-Hate-Undead-Kitpack

Chaos sorcerer: if wild mages weren't wild enough for you, here you go. See this post for a more in-depth evaluation. Short version: magic resistance improved saves vs spell help compensate for the wild mage's danger to themselves, but limited spells per level makes use of Chaotic Weave (Nahal's equivalent, pulling from a randomized list rather than from spells known) all but mandatory at times. High risk, high reward.

Chaos sorcerer:

There's a chaos sorcerer mod too. I haven't gotten around to playing with it yet but it looks pretty fun.

You mean a mod like https://github.com/Argent77/A7-ChaosSorcerer?

I Hate Undead: includes several kits specializing in fighting the undead, as well as the fascinating Dreadful Witch shaman kit, whose Dance ability debuffs enemies at the cost of her own health. Compatible with either Deities of Faerun (by the same modder) or Faiths and Powers. I won't run through all of these kits in detail, but the Death Tricker (thief or mage/thief, strong vs undead), Imprisoned Soul (sorcerer which draws on negative energy, vulnerable to magic damage and necromancy), and Holy Redeemer (cleric or fighter/cleric that gains bonuses vs undead and demons, cannot be resurrected or summon undead/demons) were the ones that stood out for me. The Deathslayer wizard kit is also a neat option - a necromancer (or fighter/mage) who's more Abhorsen than Xzar or Harrowhark, these good-aligned wizards use their own life force to gain bonuses to casting speed, caster level, and saves vs spell and death. Conceptually neat, as all of these kits involve death or the undead in some way, and enjoyable overall.