Vital Warrior (5e Feat)
From D&D Wiki
Prerequisites: Constitution 13 or higher
You have learned to hang on and survive in battle, gaining the following benefits:
- When you spend and roll a hit die to regain hit points, roll it twice and use the higher result.
- As a bonus action, you can spend and roll up to half your maximum hit dice (rounded down). You regain hit points equal to the total value of the dice rolled.