Amulet of Necromancy

Undead under your control use your proficiency bonus for their skills, saving throws, and attacks. When Undead that you control would leave your control, you can assert control over as many undead as a single cast of each necromancy spell of your would allow, without spending any spell slots. This property can only be used once per day. Your necromancy spells to raise and assert control over undead can target one additional creature or corpse.

Notes: school of necromancy wizard