Legendary resistance: Outer Realm Hitman has +10 to any and all checks on top of any other modifiers he has. Due to his unknown extraplanar properties he and his equipment are immune to the effects of the Wish spell and Banishment. 

Point blank shot: Outer Realm Hitman does not suffer disadvantage while making ranged attacks against any target while engaged.

Grit: At the end of Outer Realm Hitman's turn, he regains 4d12+8 hit points. This will not heal him if he has 0 or less HP.

Swift Counter: Whenever a melee attack fails to hit Outer Realms Hitman, the attacker will take 14 (2d10+6) bludgeon damage.

Tactical Movement: Outer Realm Hitman does not provoke attacks of opportunity. Outer Realm Hitman is not effected by difficult terrain and can Dash as a Bonus Action. 

The Right Ammo for the Job: Outer Realm Hitman's ranged attacks negate target damage resistance and immunities.

Marked for Death: Outer Realm Hitman's critical hits deal deal max damage.

I WON'T DIE THAT EASILY: Once per day, If Outer Realm Hitman is dropped to 0 or lower HP,  he is returned to 1 HP and regains 124 (14d12+12 HP).

Multiattack: Outer Realm Hitman can make two ranged attacks and one melee attack.

Mk18 Burst. Ranged Weapon Attack: +15 to hit, range 180/300 ft., Three targets. Hit: 34 (3d12+12) Piercing damage per shot. one 3 shot burst counts as one ranged attack. Fires 3 shots, each shot targets a single target. If all 3 shots hit the same target in a single turn, that target must Succeed a DC23 Con save or be left bleeding and take 4d8+4 bleeding damage for 3 turns. 30 shots until reload, Outer Realm Hitman must use an action to conduct a reload. Targets do not benefit from half cover.

One-two combo. Melee Weapon Attack: +11 to hit, range 5 ft., One target. Hit: 17 (2d10+6) Bludgeon damage. Upon hit, Target must succeed DC19 strength save or be knocked prone.

 MK25 kneecapping: Ranged Weapon Attack: +15 to hit, range 90/120 ft., One target. Hit: 19 (2d12+8) Piercing damage per shot. fires 2 shots. Upon hit target must make a DC17 Con save or have their movement speed halved for 2 rounds. 15 shots until reload, Outer Realms Hitman must use an action to conduct a reload.

Pistol Whip: Outer Realm Hitman can make a melee attack with his side arm, Weapon Attack: +11 to hit, reach 5 ft., One target. Hit: 10 (3d4 + 4) Bludgeon damage. Upon hit target must succeed a DC15 Con save or be stunned for 1 turn, targets with metal helmets have advantage on this save.  

Karambit knife swipe: Outer Realm Hitman makes a melee attack with his karambit knife, Weapon Attack: +11 to hit, reach 5 ft., One target. Hit 16 (2d8+9) Slashing damage. Upon hit target automatically looses concentration.

Fair Fight: If Outer Realm Hitman is in combat with 3 or more opponents at the same time, he can use a reaction to dodge one attack that would hit him each round.   

Outer Realm Hitman can take 3 legendary actions using the combat maneuvers option below. He can use only 1 legendary action at a time and only at the end of another creatures turn. Outer Realm Hitman regains spent Legendary actions at the start of its turn.

M84 Thunderflash (Costs 1 Actions). Outer Realm Hitman throws out a stun grenade toward the closest enemy within a 90ft radius. The target and anyone within 10ft of the Thunderflash must Succeed a DC19 dex save or be stunned, blinded & deafened for 1 turn and take 16 (2d12+4) thunder damage. Targets that save will be deafened for 1 turn instead. Outer Realm Hitman is immune to these effects.

Poison Boot knife (Costs 1 Actions). Outer Realm Hitman throws a concealed knife at a target within 40ft. +15 to hit, Target takes 15 (2d8+9) piercing damage and  must Succeed a DC 18 Con save or be Poisoned for 3 turns taking 3d10 poison damage and can not regain HP while poisoned. Poisoned characters can make a CON DC 18 save at the end of their turn to end poisoning early.

M67 Grenade (Costs 3 Actions). Outer Realm Hitman will throw a frag grenade at a target of its choice within 90ft of itself. All targets within 30ft radius of the grenade and not behind cover or prone must succeed a DC21 Dex saving throw or take 8d8+12 Force damage and will be knocked prone (half damage if passed and wont be knocked prone) Outer Realm Hitman has advantage on saving throws against this action and resistance on damage rolls involving this action. Outer Realm Hitman will not be knocked prone by this action.

Kill Shot (Costs 3 Actions). Outer Realm Hitman makes an attack and will fire 3 shots at any viable target of his choice within range of his Mk18. +15 to hit each, If this attack hits its automatically a critical hit and deals max damage.