Dispersal

In response to a creature making an attack roll against you, you attempt to discorporate into into a swarm of small creatures such as a murder of ravens or a mischief of rats, allowing you to avoid the attack.

If you invoke the response, the attacker must take disadvantage on the attack roll made against you. If the attack misses, you may move to 15 feet from your original position without taking an attack of opportunity. You will appear in the midst of the swarm, which will dissipate at the start of your next turn.