Big Arm Chicken

The chicken mutated into a large muscular monstrosity of what it used to be. During this mutation, it grew large humanoid arms that it uses to run with. It's legs still remain tiny.

Once it hits 0hp, it rages and stays enraged until it gets hit three more times. 

Multi-attack: Makes two punch attacks, or one punch and one peck

Throw person: Ranged attack: +7 to hit, reach 30 ft, 1 target. Hit: 12 (2d8 + 6) bludgeoning damage. Must already have person grappled to use this. The target of the flying person must make a DC 16 dexterity saving throw, a success lets the target swiftly move out of the way and take no damage, but the thrown will take half damage, unless they hit a wall, then the thrown will take full. A fail will result in both parties taking full damage.

Punch: Melee Weapon Attack: +9 to hit, reach 5 ft., 1 target. Hit: 15 (1d12 + 7) bludgeoning damage. The target must make a DC 16 dexterity saving throw or be grappled

Peck: Melee attack: +4 to hit, reach 5 ft, target. Hit: 7 (1d10 + 4)

Focused Rage: Once BAC gets to 1/4 of it's max health, it will rage, but will only target one person while it rages. It gains advantage on punch rolls and constitution saves, but will get disadvantage on everything else. It will not stop attacking until it's target is dead, once it's target dies, it will focus on someone else in this rage. If hit during this rage, it must make a DC 16 wisdom saving throw, if it passes, it will keep attacking the same person. A fail will result in the BAC changing targets to the person that just hit it.