Big Boned Bob

Big Bones. Whenever bob takes bludgeoning, piercing, or slashing damage, bob can make a DC 10 Con save, taking no damage on a success and half as much on a failure. Each time bob fails a save, the DC increases by 1.

Fury. When bob is reduced to half health, it deals double damage with it's Big Hammer, It's Shockwave recharges on 4-6's, deals double damage, and it can make 4 Furious Hammering attacks. Included in attacks.

Siege Monster. Bob deals extra damage to objects and structures.

Multiattack. Bob makes 2 Furious Hammering attacks, or 4 Furious Hammering attacks while at half health.

Big Hammer. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 28 (4d8 + 10) bludgeoning damage, or 56 (8d8 + 20) while at half health.

Furious Hammering. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 5) bludgeoning damage, or 28 (2d8 + 5) bludgeoning damage while at half health.

Shockwave (recharge 6 {5-6 while at half health} ). Every thing within 45 ft. of bob takes 9 (2d8) force damage and 20 (8d4) bludgeoning damage, or 18 (4d8) force damage and 40 (16d4) bludgeoning damage while at half health. if any structure falls apart because of this attack, every creature within 10 ft of the structure must make a DC 16 dex save or take 28 (5d10) bludgeoning damage. Any creature within 15 ft. of bob gets moved back up to 30 ft. If they run into a wall, they take 1d4 bludgeoning damage per 5 feet traveled.