Path of the Bonegrinder

The rules of nature govern the world, keeping a natural order in all that lives. Of these rules, a select few people believe in the following: Prey is meant to be eaten. Blood is meant to be spilled. And bones? Bones are meant to be broken. Barbarians who find chaos in order, war where there's peace, death where there's life, tend to follow this doctrine to their last breath. Their rage stems from a certain passion, the deep and unforgiving desire to crush whatever measly thing resides in the bag of flesh you'd call a creature. Those who follow the Path of the Bonegrinder aren't sated lest the bones of their enemies are pounded to fine powder, leaving an unrecognizable carcass in their wake.

Vice Grip

Once per turn starting at 3rd level, while raging, whenever you hit with an unarmed strike, you may immediately attempt to grapple the target. If you succeed in doing so, the target takes bludgeoning damage equal to your strength modifier. If you hit a target that you are grappling with an unarmed strike, you may deal this damage again.

Fighting Style

At 3rd level, you gain access to the Unarmed Fighting fighting style: Your unarmed strikes can deal bludgeoning damage equal to 1d6 + your Strength modifier on a hit. If you aren't wielding any weapons or a shield when you make the attack roll, the d6 becomes a d8. At the start of each of your turns, you can deal 1d4 bludgeoning damage to one creature grappled by you.

Grand Slam

At 6th level, while you're grappling a creature, you can fling them around to deal damage to it and any enemies nearby. You may treat a grappled creature as a two-handed melee weapon, using them for your attacks. The creature also has a thrown property with the range being a number of feet equal to ten times your strength modifier and no long range. The grappled creature deals 1d8 bludgeoning damage, with an extra d8 for every size larger than medium it is. When you hit with it, the grappled creature takes bludgeoning damage equal to your strength modifier.

Titan Breaker

At 10th level, you can grapple creatures two sizes larger than you are.

Bones to Dust

At 14th level, your speed is no longer reduced while you're dragging a grappling a creature. When you hit a target using the grappled creature as a weapon, the grappled creature must make a constitution saving throw with a DC equal to 8 + your proficiency bonus + your strength modifier or be stunned until the end of your next turn.