Resilient Soul

Choose one ability score. You gain the following benefits:

• Increase the chosen ability score by 1, to a maximum of 20.
• As a reaction, when a creature within 60 feet receives damage, you can absorb some of that damage, equal to your CON modifier, and take that damage instead.
• As a reaction, when a creature within 60 feet is going to roll a CON save, you can chose to grant that creature a bonus to this roll equal to your constitution modifier, and you take this bonus as damage. 
• You cannot use a reaction if you hitpoints total is zero, or becomes zero due to your reaction.