Ultimate Durability (5e Feat)
From D&D Wiki
Prerequisites: Constitution 13 or higher
You have become so hardy that you are able to harden yourself in everyway, whether it be your reflexes, mind or even your resolve. You gain the following benefit:
- When you make a Strength, Dexterity, Intelligence, Wisdom or Charisma save, you can choose to add your Constitution modifier to the roll. You can use this feat 3 times, and your regain all uses of this feature after you finish a long rest.