Cloud of strings

The strings of your favored stringed instrument untangle from it's base and fill the air, centered on a point you choose within range. A creature takes 4d4 slashing damage when it enters the spell’s area for the first time on a turn or starts its turn there.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 2d4 for each slot level above 2nd.

If a foe attempts to grab a string: they need to succeed on a 15DEX check. On a failed save they take 4d4 slashing damage, on a succesful save they manage to get ahold of the string and take half damage. Every round the string is held, the foe will take 1d4 slashing damage till they let go. While the string is held you will have disadvantage on all concentration spells