Dnd 2024 Wizard Necromancer. With pact of the tome nerfed, the wizard also. If your wizard is a member of the black college of necromancy, then he gets access to the secrets found.

From wizards to clerics, there are options for nearly every spellcasting. The most optimal necromancer is probably just summoning hordes on undead through the available spells as a wizard or warlock, not much more to it, just make sure they have.