Amphibious. The dragon can breathe air and water.

Spellcasting. The dragon is an 8th-level spellcaster that uses Wisdom as its spellcasting ability (spell save DC 13; +5 to hit with spell attacks). It knows the following spells from the ranger spell list:

1st Level (4 slots): cure wounds, fog cloud, hunter’s mark

2nd Level (3 slots): pass without trace, spike growth

Multiattack. The dragon makes three attacks: one with its bite and two with its claws.

Multiattack (Humanoid form Only). The ranger makes two melee attacks or two ranged attacks.

Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 15 (2d10 + 4) piercing damage plus 7 (2d6) poison damage.

Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.

Shortsword (Humanoid form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) piercing damage.

Longbow (Humanoid form Only). Ranged Weapon Attack: +5 to hit, ranged 150/600 ft., one target. Hit: 6 (1d8 + 2) piercing damage.

Poison Breath (Recharge 5–6). The dragon exhales poisonous gas in a 30-foot cone. Each creature in that area must make a DC 14 Constitution saving throw, taking 42 (12d6) poison damage on a failed save, or half as much damage on a successful one.

Humanoid Form. The dragon magically transforms into any humanoid that is Medium or Small, while retaining its game statistics (other than its size). This transformation ends if the dragon is reduced to 0 hit points or uses a bonus action to end it.