Damage Vulnerabilities force
Limited Amphibiousness. A waterdrake can breathe both air and water, but must breathe water at least once every 12 hours to avoid suffocating.
Multiattack. The drake makes two attacks: one with its bite and one with its claws.
Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 8 (2d4 + 3) piercing damage.
Claws. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (2d3 + 3) slashing damage.
Water Jet. The drake exhales a 30-foot long line of water that is 5 feet wide. Each creature in that line must make a DC 13 Dexterity saving throw, taking 9 (4d4) water damage on a failed save, or half as much damage on a successful one.
The waterdrake can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The waterdrake regains spent legendary actions at the start of its turn.
Claw. Melee Attack: +3 to hit, reach 5 ft., one target. Hit: 7 (2d3 + 3) slashing damage.
Water Jet. The drake exhales a 30-foot long line of water that is 5 feet wide. Each creature in that line must make a DC 13 Dexterity saving throw, taking 9 (4d4) water damage on a failed save, or half as much damage (rounded up) on a successful one.