Acid Blood

You draw your own blood, sacrificing a bit of your life to create a explosive fountain of acidic blood. You hit yourself with your weapon, suffering its normal damage (minimum 1 damage), then each creature in a 15-foot-radius sphere centered on a point your designate must make a Constitution saving throw. A target takes 4d4 acid damage and 4d4 necrotic damage on a failed save and is poisoned for 1 minute, or only takes the acid damage on a successful one and is not poisoned.

At higher levels: When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d4 and 1d4 for each slot level above 3rd.