Swarm Of Crows

You summon a sphere of bloodthirsty, vampiric crows that centre on a point of your choosing. When a creature enters enters the sphere, it must immediately make a Dexterity saving throw. This saving throw is also made if the creature ends its turn inside the sphere. You can use your bonus action to move the sphere 30 feet.

On a success, the target takes half damage. On a fail, they take full damage and are blinded until the end of the second round of initiative. Their movement speed is halved too.