Billy Bob Joe, the Immortal

Son of Cain - Every time Billy Bob Joe, the Immortal is reduced to 0 hit points they can make one melee or ranged attack against a target within 15 feet. On a successful hit, Billy Bob Joe, the Immortal returns to full hit points.

Scholar of the First Murder - After the effect of Son of Cain is activated, the creature that brought Billy Bob Joe, the Immortal to 0 hit points shall be marked. 

When marked, the next attack that lands against you will do an additional 2d6 psychic damage.

Unending Curse - When Billy Bob Joe, the Immortal fails to return to full hit points after Son of Cain, they shall regain all hit points after 1d4 days.

Brick - melee attack range of 5ft and a ranged attack of 30/50ft. 2d6+6 bludgeoning damage.

 Wraith of Cain - A magical curse that radiates from Billy Bob Joe, the Immortal. As a bonus action, Billy Bob Joe, the Immortal can spread his melavelont curse within 30 feet of himself. Any creature within that range must make a wisdom saving throw of 14 or be marked.