Arrow of Acid

This arrow is crafted from dark, treated wood with a slick, almost oily finish. The arrowheads are made of a strange green‑black metal that seems to sweat tiny droplets of corrosive fluid. On a hit, the arrow deals an additional 1d4 acid damage, and it explodes in a 10-foot radius. All creatures within the area must make a Dexterity Saving Throw of 11 or take 1d6 acid damage, and the floor in that area is covered in acid. 

Notes: Damage: Acid