Instinctive Fortitude

You've reached peak physical condition and can maintain it subconsciously.

• Increase your Constitution score by 1, to a maximum of 20.
• While unconscious, you can add your Constitution Modifier to death saving throws you make, as well as to Wisdom (Medicine) checks made by other creatures to stabilize you.
• When your roll for a death saving throw, any total equal to or greater than 20 can be treated as a natural 20.