Ancient Ring of Orcus

The ring of a high priest that follows Orcus the demon-prince of undeath. This ring allows you to use the 3rd level spell "Summon lesser Demon" as a bonus action once a day. The ring binds this demon to you making it impossible for the demon to not obey your commands.

Alternatively you can use wear the ring and it will passively grant you +1 to hit and damage against undead and any undead -1 to hit and damage against you. You may use this passive in junction with the Rings second ability, Bend undeath, once a day you can choose any non-legendary undead with a CR rating equal to or lower than your character level, and it must make a WIS saving throw or permanently become your ally. The WIS DC for the target is 11+ half your spellcasting ability modifier rounded up

Notes: Character must be a Sorcerer, Wizard, or Warlock and have at least 1 necromancy spell to use this ring, Creation, Summoning, Combat, Jewelry, Handwear