Corrosive Wounds

You brandish the weapon used in the spell’s casting and make an attack with it against one creature within reach or range, which counts as magical for resistance purposes for this attack. On a hit, the target suffers the weapon attack’s normal effects, and you can cause acid to seep into the target's wound at the start of each of it's turns for 1 minute or until a creature uses an action to scrape it off. This acid damage equals your spellcasting ability modifier.

This spell’s damage increases when you reach certain levels. At 5th level, the target take an additional 1d6 acid damage(1d6 + spellcasting mod), also at 11th level(2d6 + spellcasting mod), and 17th level(3d6 + spellcasting mod). On each subsequent turn, the target takes a d6 less acid damage for the duration of the spell.