Bloat Beetle Queen

Acidic Fluid. Any nonmagical weapon that hits the queen corrodes. After dealing slashing or piercing damage, the weapon takes a permanent and cumulative -1 penalty to Damage rolls. If its penalty drops to -5, the weapon is destroyed. Non magical Ammunition that hits the creature is destroyed after dealing damage.

Multiattack. The queen makes three attacks one with its bite and two with its Acid Splash.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) piercing damage.

Acid Splash. Ranged Weapon Attack: +2 to hit, range 20/60ft., one target. Hit: 7 (2d6) acid damage.

Additionally if the target fails the saving throw and is wearing armour or holding a shield, their armour or shield (DM's choice) has a -1 penalty to the protection it provides. Magical shields and armour are immune to this effect. If a piece of armour's AC is reduced to 10 or if a shield's bonus is reduced to +0 it is destroyed.

Acid Spray. (Recharge 5-6). The queen sprays acid in a 30-foot line that is 5 feet wide. Each creature in that line must make a DC 12 Dexterity saving throw, taking 22 (4d10) acid damage on a failed save, or half as much damage on a successful one.

Additionally if the target fails the saving throw and is wearing armour or holding a shield, their armour or shield (DM's choice) has a -1 penalty to the protection it provides. Magical shields and armour are immune to this effect. If a piece of armour's AC is reduced to 10 or if a shield's bonus is reduced to +0 it is destroyed.