Dispersal

In response to a creature making an attack roll against you, you attempt to discorporate into a swarm of small or tiny creatures, such as crows or snakes, to avoid your foe's attack.

After casting this spell, the creature who made the attack roll must make the roll at disadvantage. If the attack misses, you may teleport to an unoccupied space that you can see within 15 feet of you, where you reappear with the swarm.