Cloak of the Bat

While wearing this cloak, you have advantage on Dexterity (Stealth) checks. In an area of dim light
or darkness, you can grip the edges of the cloak
with both hands and use it to fly at a speed of
40 feet. If you ever fail to grip the cloak's edges
while flying in this way, or if you are no longer in
dim light or darkness, you lose this flying speed.
In an area of darkness, you can use your action to
cast polymorph on yourself into a bat. The cloak
can't be used this way again until the n