Amber Periapt of Hellish Possession

A dull sphere of amber affixed in place by makeshift string wrappings. Allows the wearer to cast Hellish Possession without meeting the warlock level requirements. 

Hellish Possession: Starting at 4th level, once per day a warlock can call upon their patron entity for aid. In order to succeed, the player must roll their level or below on a d100, + their CHA modifier. Upon a success, the entity will possess the character for 1d4 rounds. The DM will take control of the PC and take actions in the player's place. This will temporarily grant immense power congruent with the entity as determined by the DM. The actions of the entity will not necessarily reflect the desires of the player, however will aid in the task it was called forth to do. Empower: The caster can choose to expel a spell slot upon succeeding in order to increase the duration of the spell by 1d4 per spell level. Upon a successful possession, this ability cannot be used again for 7 days. If failed, it can be restored after a long rest. After reaching level 20 in warlock, this spell will automatically succeed.

Notes: Must be attuned with a long rest.