You've manifested the resilience emblematic of Hill Giants, granting you the following benefits: 

Bulwark : When you are subjected to an effect that would move you at least 5 feet or knock you prone, you can use your reaction to steady yourself. You are then neither moved nor knocked prone.

Hearty Health :  When you are subjected to a spell rhat restores your hit points, you can regain additional hit points equal to your Constitution modifier. You can regain these additional hit points a number of timese equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.