Acid Blade

Holding an armament, the user brandishes their weapon against a foe within 5 feet. On a hit, the target suffers the weapon attack’s normal effects and then becomes covered in stinging acid until the start of your next turn. If the target willingly moves 5 feet or more before then, the target takes 1d4 acid damage, an acid debuff of -1 AC is applied, and the spell ends.

This spell’s damage increases when you reach certain levels. At 5th level, the damage the target takes for moving increases to 2d4 and -2 debuff to AC. At 11th level this increases by another 1d4 (3d4) and to -3, and again at 17th level (4d4 and -4).