The Elder Scrolls: Tamriel real

While wearing this cloak, you have advantage on Dexterity (Stealth) checks. In dim light or darkness, you can grip its edges to fly at 40 ft. speed. You lose this flight if you stop gripping the cloak or leave dim light/darkness. Also in dim light or darkness, you can use an action to cast polymorph on yourself, turning into a bat while keeping your mental stats. This ability can’t be used again until the next dawn.