As a Bonus Action, you gain Tremorsense with a range of 60 feet for 10 minutes.  You must be on a stone surface or touching a stone surface to use this Tremorsense.  The stone can be natural or worked.

You can use this Bonus Action a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a Long Rest.

You are descended from Giants. Choose one of the following benefits—a supernatural boon from your ancestry; you can use the chosen benefit a number of times equal to your Proficiency Bonus, and you regain all expended uses when you finish a Long Rest:

 Hill’s Tumble (Hill Giant). When you hit a Large or smaller creature with an attack roll and deal damage to it, you can give that target the Prone condition.

Stone’s Endurance (Stone Giant). When you take damage, you can take a Reaction to roll 1d12. Add your Constitution modifier to the number rolled and reduce the damage by that total.

Starting at character level 5, you can change your size to Large as a Bonus Action if you’re in a big enough space. This transformation lasts for 10 minutes or until you end it (no action required). For that duration, you have Advantage on Strength checks, and your Speed increases by 10 feet. Once you use this trait, you can’t use it again until you finish a Long Rest.

Starting at character level 10, you gain the following ability based on your Giant Ancestry:

Stone Symbiosis (Stone Giant):  You can cast Stoneskin a number of times equal to your proficiency bonus.  When cast with this ability, Stoneskin allows you to automatically succeed at hiding if there is a source of stone adjacent to you.

Stone Craft (Hill Giant): You can cast Shape Stone a number of times equal to your proficiency bonus as a bonus action.