Caustic Touch

Your hand begins to drip with a caustic liquid. Make a melee spell attack against a creature within range. On a hit, the target takes 3d4 Acid Damage, and if the target is wearing non-magical metal armor, it begins to be dissolved. Starting on this round and continuing on the start of each of the creatures turns the armor suffers a -1 penalty to its AC. If the armor's AC is reduced to 10 it is destroyed.

When you cast this spell at higher levels using a spell slot of 2nd level or higher, the damage increases by 1d4 for each spell slot above 1st.