Vodoo Dolls and Shrunken heads should be the iconic necromancer weapons. To inflict pain and death and summon the dead from afar or to then curse targets for each melee attack with these weapons would be a cool concept.
EDIT: I change my mind on Vodoo Dolls. Dolls should be the witch's weapon. Not Necromancer. The necromancer would be the summons counterpart to the dark magic. Wheras Witches are the curse and debuff class.