Corroding Strike

Transmutation cantrip
Casting Time: 1 action
Range: Self (5-foot radius)
Components: S, M (a melee weapon worth at least 1 sp)
Duration: 1 round
You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you. On a hit, the target suffers the weapon attack’s normal effects, and the next attack against it ignores resistance to one of its damage types until the start of your next turn.
At Higher Levels. At 5th level, the melee attack deals an extra 1d8 Acid damage to the target on a hit, the damage rolls increase by 1d8 at 11th level (2d8) and again at 17th level (3d8).
Spell Lists. Druid, Sorcerer, Warlock, Wizard