Amphibious. Can breathe air and water.

Corrupt Water. At the start of each of Zaburra's turns, exposed water within 30 feet of it is befouled. Underwater, this effect lightly obscures the area until a current clears it away. Water in containers remains corrupted until it evaporates.

A creature that consumes this foul water or swims in it must make a DC 18 Constitution saving throw. On a successful save, the creature is immune to the foul water for 24 hours. On a failed save, the creature takes 21 (6d6) poison damage and is poisoned for 1 minute. At the end of this time, the poisoned creature must repeat the saving throw. On a failure, the creature takes 27 (6d8) poison damage and is poisoned until it finishes a long rest.

Magic Resistance. Zaburra has advantage on saving throws against spells and other magical effects.

Undertow. As a bonus action when Zaburra is underwater, it can cause all water within 60 feet of it to be difficult terrain for other creatures until the start of its next turn.

Multiattack. Zaburra uses Grasping Torrent and makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 27 (4d10 + 7) piercing damage.

Claws. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 21 (4d6 + 7) slashing damage.

Tail. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 13 (2d6 + 7) slashing damage.

Grasping Torrent. Zaburra launches a spout of water at one creature it can see within 60 feet of it. The target must make a DC 20 Strength saving throw, and it has disadvantage if it’s underwater. On a failed save, it takes 25 (4d8 + 7) acid damage and is pulled up to 60 feet toward Zaburra. On a successful save, it takes half as much damage and isn’t pulled.

Legendary Resistance: (3/day) Should Zaburra fail a saving throw he can choose to succeed instead.

Legendary Actions: (3 actions)

Shriek: (2 actions) Zaburra unleashes a booming shriek that forces any creature within 30 feet to make a DC 18 Constitution saving throw or take 3d6 thunder damage.

Tail: Zaburra can make one tail attack.