Greetings
For the Necromancer as a dark thaumaturgist, I like Staffs, Wands, Daggers, Grimoires, etc., all of them themed with bones, spider-webs and death.
Another concept of Necromancer could be a melee fighter with Scythe or Great-sword, and leather armor, empowered with blood and bone spells. It could be called Bone Reaper.
See you