Crusher

Flesh Battering Ram. The Crusher can only move in strait lines as the more it moves the more damage it does to creatures. For every 5ft of movement the Crusher does an additional 1d10 damage to a maximum of 50ft. If there is a creature or object within 5ft when the Crusher ends its movement it takes this damage. 

Crusher, oh wait that's me! This creature does double damage to objects. 

Horrific Death. When The Crusher dies, it chooses to either expend a use of horrific regeneration, or explode into two Evolved Wolves which immediately take their turn. 

 Multi Attack. The Crusher makes 2 claw attacks and 1 crush attack. 

Claw. Melee Weapon Attack: +10 to hit, 1 target., reach 5ft. Hit 17(5d6) slashing damage. If the target is hit by this attack, they are grappled. 

Crush. Constitution Saving Throw DC18. Failure: take 45(10d8) bludgeoning damage and begin to suffocate. This mirrors the silenced effect for the rules of spells with verbal components or verbal commands. A creature affected by this attack has a number of rounds to break free equal to their CON modifier to a minimum of one. If they do not break free then are instantly dead. Success: Half Damage only. 

Horrific Regeneration 1/day. When this creature drops to 0 hit points it instead gains 50 hit points. Gaining an additional 10 hit points at the start of its next 3 turns.