So looking over the Necromancer as the rest of my house sleeps, I could not sleep as my shoulder hates me.
Weapons: Sure.
Armor: OK.
HP: OK.
Deathwalk: The unique hook of the class, an expansion of the Shadowdark setting/cosmology. I dont know if its a reference to anything else with the River/Gates thing, but I like it. (As an aside I think base Shadowdark IS Sword and Sorcery, but whatever!)
Death Sense: Cool.
Holy Symbol: OK.
Spellcasting: Charisma Caster, on Priest progression, not surprising since the Weapons/Armor/HP are all beyond the 'pure caster' Wizard.
Talents: 2 is obviously very unique, the rest is hybrid physical/caster approach.
Spell List?
HP Manipulation, drains, the expected Undead stuff.
I see some spells have been reskinned from their originals. No hate, I did the same, as there are just some things that to re-write fully is not worth the squeeze. Necronomicon, Vision.
All in all, these all fit the Necromancer, where it breaks off into its own space, is the Deathwalk.
Getting to the Fifth Gate looks like it would be an epic feat, and going in after a spirit looks like a .... death sentence.
All told, really cool, unique feature and hook for the class.