Bargainer's Mantle

Bargainer's Mantle
Wondrous item, very rare (requires attunement by a warlock)

Whilst attuned to and wearing this cloak, you have advantage on Charisma (Persuasion) checks, and any spells granted by Eldritch Invocations that ordinarily requires a warlock spell slot or a rest between uses, may now be cast at will.

Notes: Advantage: Persuasion