Dnd 2024 Wizard Necromancer. There are 12 classes in the 2024 phb (no. 6+ months ago crawford promised a necromancer wizard in a video and even talked its unique design up.
Enchanter, necromancer, conjurer and transmuter) before revisiting that one. 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.