Tofana's Cut Through Serum

A shimmering green aura surrounds any weapon you pour this liquid onto - if the weapon isn't made of adamantium it melts.

For 1 hour when you successfully hit a target with the weapon it takes 4d4 acid damage and 2d4 acid damage at the end of its next turn. 

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage (both initial and later) increases by 1d4 for each slot level above 2nd.