Homebrew

Traits

Evasion. If the assassin is subjected to an effect that allows it to make a Dexterity saving throw to take only half damage, the assassin instead takes no damage if it succeeds on the save and only half damage if it fails. It can’t use this trait if it has the Incapacitated condition.

Actions

Multi Attack. Make two attacks from below.   Revolver (single shot). To hit: 1d20+10 , on hit 2d8+7 Piercing or bludgeoning damage.

Rapidshot (rapid fire). Use your Action to spray bullets in a 15 ft Cone centered on the user. All creatures in the Cone must make a Dexterity Saving Throw DC15, on failure they take 2d8+7 Piercing damage, Fatal Shot (when creature rolls natural 1 or fails the Saving Throw by 10 points or more, add 16 additional points of damage), on success they take damage equal to your Dexterity Modifier. Roll the damage once and apply to every creature that failed. This consumes 10 bullets.

Club. To hit: 1d20+7 , on hit 1d6+4 Bludgeoning damage.

Bonus Actions

Cunning Action. The assassin takes the Dash, Disengage, or Hide action.   Hunker down. Upgrade cover to one level higher.   Fire Bomb. Does 8d6 Fire damage to every creature and object in a 20 ft. radius. Creatures caught in the blast must make a Dexterity Saving Throw DC15, on success the creature takes half damage.