Path of Seismic Force

Those who follow this path have trained their bodies to become weapons of destruction. They harness seismic energy to manipulate their enemies bodies and dominate them with martial prowess. 

Grapple Master

At 3rd level when you select this subclass, you gain proficiency in unarmed strikes. You can attempt to grapple a creature using an unarmed strike. When you are raging, you can also attempt grapples using a bonus action. While you have a creature grappled they are restrained. 

Forceful Slam

At 6th level you learn to use your enemies body against them, manipulating it to incur damage. When you raging, you have an enemy grappled, and are standing you can make an unarmed attack to slam them to the ground doing 2d6 force damage plus your STR modifier and your rage bonus. If the attack is successful they can make an attempt to break the grapple at disadvantage or remain grappled by you. If the attack is unsuccessful they will remain grappled by you. After this attack both of you are prone. At level 10 the slam deals 3d6 force damage and at level 14 4d6 force damage. 

Improved Grappling

At 10th level you begin to harness seismic strength. You can now attempt grapple creatures two sizes larger than you and attempts to grapple you are made at disadvantage. When you are raging, you can attempt to grapple a creature three sizes larger than you. In addition, standing from prone uses no movement.  

Seismic Slam

At 14th level you can now channel your seismic energy into a single slam attack. When you’re raging and you have a creature grappled you can use an action to make a single unarmed attack to deliver a massive slam attack. On a successful hit you deal 8d12 force damage plus your STR modifier and rage bonus. Further, you can expend as many hit dice you wish to add extra damage, if you do this you take force damage equal to the extra damage done by the hit dice expended. Wether this attack is successful or not, the creature is no longer grappled by you and you are both prone. You can do this an amount of times equal to your CON modifier per long rest, minimum of 1. Additionally, while raging, you cannot be restrained.