Multiattack

The locksmith makes two key blade attacks.

Key Blade

Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 18 (3d8 + 5) slashing damage.

Acid Wash (Recharge 5-6)

The locksmith emits a cloud of rust in a 60-foot cone. Each creature in that area must succeed on a DC 16 Dexterity saving throw, taking 35 (10d6) acid damage on a failed save, or half as much damage on a successful one.