Boon of Invulnerability, Variant (5e Epic Boon)
From D&D Wiki
Boon of Invulnerability
Your body has been hardened until you are nearly unbreakable by physical blows. Bludgeoning, piercing, and slashing damage that you take is reduced by 5. You can take this boon a second time; if you do, bludgeoning, piercing, and slashing damage that you take is reduced by 10. Keep in mind that, per the rules of damage resistance and vulnerability, resistance and then vulnerability are applied after all other modifiers to damage.