Curse of the Protector

Your Wisdom or Constitution score increases by 1.

You cannot bear to see others come to harm. When a friendly creature you can see within 10 feet takes damage, you may choose to take the damage instead. 
Whenever a healing spell targets you, the caster of the spell regains hit points equal to your Constitution modifier. 

Whenever a friendly creature you can see takes damage, if you choose not to take that damage, you take 1d6 psychic damage.