Cackling Corset

Wondrous item, rare (requires attunement by a warlock)

This laced blouse and support garment has ribs of bone and is adorned with grotesque fetishes and trophies. You have advantage on Charisma (Intimidation) checks, and the DC of any fear effect you create is increased by 1. You can cast bane using a warlock spell slot, and each round on your turn you can cackle as a bonus action in order to maintain concentration on your bane spell. If you do so, you can cast other spells without breaking your concentration on bane.