Burning Blood Viper

Opening a vial of black blood, the blood forms to the shape of a viper, snaking towards the desired target, wrapping around the legs, and causing a burning sensation. Target must make a DC15 Dexterity saving throw or take 2d8 necrotic damage and 1d4 necrotic damage at the start of each turn until expending an action to remove the snake, or it disappears after 10 minutes. Damage increases by 1d8 and 1d4 for each Spell slot level expended above level 3.