Cloak of the Bat
Wondrous Item,
Rare
(requires attunement; cost 5000 gp)
Crafting Components
Blood from a vampire spawn
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.
Source