Transmuting Strike

As part of the action used to cast this spell, you must make a melee or ranged attack with a weapon against one creature within the weapon’s range, otherwise the spell fails. If the attack hits the target suffers the attack’s normal effects and the attack deals an extra 1d4 damage of the same type as the weapon, and the target must succeed on a Wisdom Saving throw. on a failed saving throw the target's AC is reduced by 1d4 for 1 round, as the strike's magic briefly transmutes part of the target into glass.

This spell's effect increase when you reach higher levels. At 5th level, the extra damage the target takes from both the spell and the amount the targets AC is lowered increases to 2d4. At 11th level they both increase to 3d4 and to 4d4 at 17th level.