Acid Blood

A target you see within range must make a DC Constitution saving throw. On a failed save, the creature's blood turns to acid and takes 2d10 acid damage and 2d10 necrotic damage at the start of each turn, burning it from the inside. In addition to this, the creature is poisoned until cured. On a successful save, the creature takes full damage but is not poisoned. Until the spell ends, you can use a bonus action on each of your subsequent turns to cause this damage again.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d10 acid and 1d10 necrotic for each spell slot above 3rd.