Unyielding Endurance

Prerequisite: 4th level
You possess an implausible resilience and are capable of amazing feats of endurance. You gain the following the following benefits:

• Ability Score Increase. Increase your Strength or Constitution modifier by 1, to a maximum of 20.
• Rapid Recovery. When you roll a Hit Die to regain hit points, the minimum number of hit points you regain from the roll equals twice your Constitution modifier (minimum of 2).

Unyielding Endurance - Active Ability (Reaction)

• As a reaction to taking damage, you can brace yourself to weather the blow and any additional blows. Until the start of your next turn, you can reduce all damage taken (including from the damage that triggered this reaction) by your Proficiency bonus and gain advantage on Strength and Constitution saving throws. Additionally for the duration, if an attack would reduce you to 0, you can make a Constitution saving throw with a DC to the amount of damage taken. On success, you are reduced to 1 instead. If you are not incapacitated at the start of your next turn after using this feature, you can expend a number of hit dice up to your Proficiency bonus, rolling them as normal.

Once you use this feature you cannot use it again until you complete a short or long rest.