Chicken Behemoth

Ultimate Peck Punch. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit:22  (3d8 + 10) [bludgeoning] damage. 

Chicken maelstrom. Ranged Weapon Attack: +5 to hit, range 20/60 ft., several  targets. Hit: 12 (2d8 + 5) [bludgeoning] damage. The chicken behemoth loses 2d8 hp

Feathery shock wave. Melee Weapon Attack: +5 to hit, reach 60 ft., several targets. Hit:9  (1d8 + 15) [force] damage. If targets are creatures, then they must succeed on a d20 strength throw or be knocked prone and blinded.

Disintegrate. If the chicken behemoth falls into water more than 3 feet deep, it is immediately defeated, and falls apart, each chicken running in a separate direction .

Slash resistance. If the chicken behemoth is hit with a nonmagical slashing attack, remove 15 from the base damage.

Explosive vulnerability. If the chicken behemoth is hit with an explosion, add 12 to the base damage and two more for every 2 feet closer to the behemoth the explosion is.

Seed hoarder. If a creature with any kind of  seeds comes within 100 ft. of the chicken behemoth, the behemoth lets out a roar, and the creature must succeed on a d20 strength throw or be deafened.

Seed rage. If a creature with any kind of seeds comes within 60 ft. of the chicken behemoth, the behemoth goes into a rage in which it does +5 damage per attack

I aint' no chicken. If the chicken behemoth is hit with a frightening attack, it lets out a roar, and any creature within 30 ft. must succeed on a d20 strength throw or be deafened.

Every five actions, the chicken behemoth may do a legendary action

Quad-Smash (Costs 2 Actions). The chicken behemoth does an Ultimate Peck Punch on four different targets.

Chomp (Costs 2 Actions). The chicken behemoth grabs a medium or smaller creature that is within 20 ft. of it, making it Restrained. The creature must succeed on a d20 strength throw to stop being Restrained and escape.  If the creature remains Restrained, the chicken behemoth swallows it. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the chicken behemoth , and it takes 7 (2d8) piercing damage at the start of each of the chicken behemoth’s turns.

If the chicken behemoth takes 25 damage or more on a single turn from a creature inside it, the chicken behemoth must succeed on a DC 20 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 20 feet of the chicken behemoth. If the chicken behemoth dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 20 feet of movement, exiting prone.