Wondrous item, very rare (requires attunement)

A dark purple mask that can be donned and doffed as an action. While wearing this mask, you have advantage on Charisma (Intimidation) checks against humanoids, and you can communicate telepathically with any creature you can see within 30 feet of you. You don't need to share a language with the creature for it to understand your telepathic utterances, but the creature must be able to understand at least one language.

When you're wearing this mask in dim light or darkness, you can use a bonus action to become invisible, along with anything you are wearing or carrying. The invisibility lasts until you use a bonus action to end it or until you attack, cast a spell, is in bright light, or is incapacitated. While invisible this way, you hover 1 foot above the ground and can move through other creatures and objects as if they were difficult terrain. You take 5 (1d10) force damage if you end your turn inside an object.

If you reduce a creature to 0 hit points immediately after breaking this invisibility, you can take this bonus action again without spending a use of this ability.

Once you've used this ability five times, you can't use it again until you've finished a long rest.

Imprinted on this mask is a fragment of a fiendish persona. A character who attunes to the mask gains the following flaw: "You are prone to cause trouble for others when no-one's watching you." This flaw trumps any conflicting personality trait.