Amphibious. The dragon can breathe air and water.

Keen Hearing and Sight. The dragon has advantage on Wisdom (Perception) checks that rely on hearing or sight.

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

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.

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.

Alter Shape. The dragon magically transforms into a raven or a scout and retains its alignment, damage and condition immunities, hit points, and Hit Dice, as well as its Intelligence, Wisdom, and Charisma scores. This transformation ends if the dragon is reduced to 0 hit points or if it uses another bonus action to end it.