Add these onto the Parent Race
Stonebound Footing
While standing, if you would be pushed or pulled, you may instead move 10 fewer feet in the direction you were being moved. In addition, while standing you have advantage on saving throws against being knocked prone, pushed, or pulled.
Boulder Toss
If you make an improvised ranged weapon attack with a stone you can lift, you may add your proficiency bonus to that attack. Use your Strength modifier instead of Dexterity for ranged attacks and damage when attacking with a stone. Use the table in the entry panel to determine how far you can throw a stone, and the damage it deals. You can wield stones up to 50 lbs with one hand-- this increases to 150 lbs at 8th level.