Source: Bigby Presents - Glory of the Giants

Prerequisite: 4th Level, Strike of the Giants (Hill Strike) Feat

You’ve manifested the resilience emblematic of hill giants, granting you the following benefits:

• Ability Score Increase. Increase your Strength, Constitution, or Wisdom score by 1, to a maximum of 20.
• Bulwark. When you are subjected to an effect that would move you at least 5 feet or give you the prone condition, you can use your reaction to steady yourself. You aren’t moved and don’t have the prone condition.
• Iron Stomach. Whenever you eat food as part of a short rest and spend one or more Hit Dice to regain hit points, you regain additional hit points equal to your Constitution modifier + your proficiency bonus.