Path of Gravitation

 Rage so condensed that it can change the weight and gravity of what you wield. A barbarian of the path of gravitation can change the mass and density of their own fists. Make their opponents feel weightless in their hands. Following this path is one of brutal savagery, when weight is under your command the very laws of physics crumble in your hands to strike fear into the hearts of your enemies. 

Heavyweight

Lvl 3: You are proficient with improvised weapons

While raging you gain the following benefits if you aren’t wearing heavy armor or wielding a shield:

You can treat a creature you are grappling as an improvised weapon. When you hit another target using a grappled creature as an improvised weapon, the grappled creature takes damage equal to your strength modifier plus your proficiency bonus. When you use a creature as an improvised weapon it gains the following properties: Two-handed, heavy, thrown with a range of 10/20, and reach 10ft if the creature is large or bigger.

The first time on your turn when you hit a creature with a melee weapon attack, you can immediately try to grapple the target as a bonus action. When you enter your rage you can immediately grapple with the same bonus action.

If your size is Small, you don’t have disadvantage on attack rolls when wielding a heavy weapon.

Massive Deal

Lvl 3: You gain proficiency in intimidation if you don’t already have it, and add twice your proficiency to Intimidation checks

you count as one size larger when determining your carrying capacity and the weight you can push, drag, or lift.

Density Control

Lvl 6 While raging you gain the following benefits if you aren’t wearing heavy armor or wielding a shield:

Your unarmed strikes and attacks with any melee weapons or improvised weapons that aren’t light deal damage equal to 1d12 plus your strength modifier and gain the following properties: Heavy.

Your unarmed strikes and attacks with a grappled creature are considered magical for overcoming resistances.

You can try to grapple or shove a creature up to two size categories larger than you.

Your speed is no longer halved when you try to move a creature you’re grappling.

Brutal Kill

Lvl 10: While you are raging, if you reduce a creature to 0 hit points, you can choose to kill them brutally, tearing off limbs and savaging your enemy. The violent display terrifies those around you.

Any enemies that see you must make a successful wisdom saving throw or become frightened of you for the next minute. The save DC is 8 + your proficiency bonus + your strength modifier. At the end of each of its turns, the target can make another Wisdom saving throw. On a success, the effect ends on the target.

Once you use this feature you must finish a short or long rest before you can do so again.

Center of Gravity

Lvl 14:

You can grapple or shove any creature regardless of size. You ignore the weight of the creature when lifting or moving it.

When you are raging, whenever you grapple you may also attempt to shove.