Cloak of the Bat

While wearing this cloak, you gain advantage on Dexterity (Stealth) checks. In addition, while in an area of dim light or darkness , you gain the following benefits:

* A fly speed of 40 feet while gripping the edges of the cloak with both hands.
* Once between long rests you can use an action to cast polymorph on yourself, transforming into a bat. Unlike normal, you retain your Intelligence, Wisdom, and Charisma scores.