Swarm Cloak

You conjure a fleet of fey spirits that take the form of a swarm of insects, crows, bats, or similar flying animals. The swarm surrounds you to a distance of 10 feet for the duration, and its area is lightly obscured. When you cast this spell, you can designate any number of creatures you can see to be unaffected by it. An affected creature's speed is halved while in the swarm, and when the creature enters the swarm's space for the first time on a turn or starts its turn there, the creature must make a Dexterity saving throw. On a failed save, a creature takes 5d10 piercing damage, or half as much on a successful one.

You can use your action to end the spell and send the swarm soaring down a line 120 feet long and 5 feet wide. Each creature in the line must make a Dexterity saving throw. A creature takes 6d10 slashing damage on a failed save, or half as much on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the damage done by the ending effect of the spell increases by 1d10 for each slot level above 6.