Cheese Dragon (version 2)

Flyby. The Cheese Dragon doesn't provoke opportunity attacks when it flies out of an enemy's reach.

Cheesy Skin. A creature that touches the Cheese Dragon or hits it with a melee attack while within 5 feet of it takes 4 (1d8) acid damage. Any nonmagical weapon made of metal or wood that hits the cheese dragon corrodes. After dealing damage, the weapon takes a permanent and cumulative −1 penalty to damage rolls. If its penalty drops to −5, the weapon is destroyed.

Nonmagical ammunition made of metal or wood that hits the dragon is destroyed after dealing damage.

Swallow. If the Cheese Dragon succeeded on a bite attack against a Medium or smaller creature, the target must make a DC 16 Dexterity saving throw or be swallowed and transported to its cheese-filled stomach. A swallowed creature is blinded and restrained, it has total cover against attacks and other effects outside the Cheese Dragon, and it takes 21 (6d6) acid damage at the start of each of the Cheese Dragon's turns. If the Cheese Dragon takes 20 damage or more on a single turn from a creature inside it, it must succeed on a DC 15 Constitution saving throw at the end of that turn or regurgitate the swallowed creature, which falls prone in a space within 10 feet of the Cheese Dragon. If the Cheese Dragon dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 20 feet of movement, exiting prone.

Cheesy Breath. The Cheese Dragon can exhale a 30-foot cone of molten cheese. Each creature in that area must make a DC 15 Dexterity saving throw, taking 28 (6d8 + 1) fire damage on a failed save, or half as much damage on a successful one. Additionally, creatures that fail the save are covered in cheese and restrained until they take an action to remove the cheese.

Multiattack. The Cheese Dragon makes two attacks: one with its bite and one with its claws.

Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 7 (2d4 + 2) fire damage and 3 (1d4 + 1) piercing damage.

Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (1d8 + 4) slashing damage and 2 (1d4) fire damage.