Actions

Multiattack. The Avatar of Wilbert makes three attacks with any combination of its bite and its tail.   Bite. Melee Weapon Attack. +18 to hit, reach 5 ft., one target. Hit: 42 (5d12+10) piercing damage.   Call of the Sea (3/Day). The Avatar of Wilbert calls the creatures of the sea to its aid. A number of creatures determined by the Call of the Sea table appear in unoccupied spaces within 300 feet of the Avatar of Wilbert. Summoned creatures obey the Avatar of Wilbert's commands, have a flying speed equal to their swimming speed, and are surrounded by a sphere of water, allowing them to breathe and gain other benefits of being underwater.

  Deluge Breath (Recharge 5-6). The Avatar of Wilbert exhales a high-pressure stream of water in a 300 foot line that is 10 feet wide. Each creature in that line must make a DC 26 Strength saving throw or take 70 (20d6) bludgeoning damage and be pushed 2d4x5 feet away from the Avatar of Wilbert on a failed save, or take half as much damage on a success and not be moved.   Tail. Melee Weapon Attack. +18 to hit, reach 10ft., one target. Hit: 32 (4d10+10) bludgeoning damage and the target is pushed 15 feet away from the Avatar of Wilbert and knocked prone. The target must succeed on a DC 20 Constitution saving throw or be stunned until the end of its next turn.

Legendary Actions

The Avatar of Wilbert 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 Avatar of Wilbert regains all legendary actions at the start of its turn.   Tail. The Avatar of Wilbert makes one tail attack.   Wail of the Deep (Costs 2 Actions). Each creature of the Avatar of Wilbert's choice within 120 feet of it that can hear it must make a DC 26 Wisdom saving throw or be frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, that creature is immune to being frightened by the Avatar of Wilbert's wail of the deep for 24 hours. If a creature is inside the Avatar of Wilbert's aura of water when it uses wail of the deep, it takes 11 (2d10) thunder damage, whether it succeeds on the saving throw or not.