Bossk

Expert Sniper. Bossk's ranged attacks score a critical on a roll of 19-20.

Ultimate Predator. Whenever Bossk defeats an enemy with a Melee Attack, he may move up to 20 ft. and/or make a Claw attack. If both, they must be done in that order. This trait can be used multiple times on one turn, and even on other creature's turns.

Poison Immunity. Bossk is immune to any and all poisons.

Regeneration. Bossk regains 1d3+7 hit points every 10 rounds or 1 minute. If he loses a limb, it regrows in 1d6+1 days.

Multiattack. Bossk makes 3 attacks: two with his Relby-V10 and one claw attack.

Claw. Melee Weapon Attack: +16 to hit, reach 5 ft., one target. Hit: 11 (1d8+7) slashing damage.

Relby-V10 Automatic Rifle. Ranged Weapon Attack: +14 to hit, range 150/600 ft., one target. Hit: 27 (4d10+5) force damage. 

Bossk can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. Bossk regains spent legendary actions at the start of his turn.

Relby-V10. Bossk makes one attack with Relby-V10.

Claws (Cost 2 Actions). Bossk moves up to 10 ft. without provoking opportunity attacks, then makes 2 claw attacks. These follow the rules of the Ultimate Predator trait.