Thorns of Agony

ALL credits to Rose knight's Homebrew on youtube

Inky black tendrils erupt from your body attacking any creature that are near you. Each creature within 5 feet of you must make a dexterity saving throw. On a failure they take 2d8 slashing damage, or half as much on a successful save. At higher levels: when you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d8 for each slot level above first level.