Acidbrand Weapon

You wreathe a weapon you are holding in corrosive acid.

Until the spell ends, when you hit with the weapon, the target takes an extra 1d6 acid damage on hit.

Corrosive Strike

The target takes 1d6 acid damage at the start of its next turn.

Elemental Resonance. When you cast a spell of the same element while this spell is active, its effects intensify. The first time you do so before the spell ends, increase the extra damage by 1d6 and enhance the rider effect (described in each spell). This benefit can occur only once per casting.

Elemental Resonance (Acid)
Extra damage becomes 2d6
Ongoing damage becomes 2d6
Target’s AC is reduced by 2 until the start of your next turn