Undead Bonesaw

Reckless. At the start of its turn, the berserker can gain advantage on all melee weapon attack rolls during that turn, but attack rolls against it have advantage until the start of its next turn.

Rage. As a Bonus Action, Bonesaw can rage to add +4 to his damage, gain advantage of Strength saves and Athletics checks, and resistance against Bludgeoning, Piercing, and Slashing damage. This effect lasts for 1 minute or until unconcious. 

Brutal Critical. Bonesaw can add two additional damage dice to a critical hit.

Relentless Rage. While raging, if knocked to 0 HP, Bonesaw can stabalyze at 1 HP if a DC of +10 is made. The DC increases by 5 with each use before a long rest. 

Multi-Attack. Bonesaw can attack 3 times per action. 

Tearing Strike. Unarmed attack: +10 to hit, reach 10 ft., one target. Hit: 15 (1d6 + 10) Bludgeoning damage.

Biting. Unarmed attack: +10 to hit, reach 5 ft., one target. Hit: 11 (1d4 + 10) Piercing damage.

Thunderwave. Bonesaw can cast Thunderwave at 4th level 3 times a day. (5d8)

Snap, crackle, pop. Once per short or long rest, Bonesaw can use his reaction to bring down a lightning strike upon any target he chooses. The target must succeed in a Dex Saving Throw, DC 14, or take 6d6 Lightning damage.