Share Your Pain

In moments of great physical pain, your mind lashes out almost unconsciously to a creature around you. 

When you take damage from a critical hit, as a reaction, you can cause that damage to a creature of your choice as psychic damage. 

And, once per long rest, when you reach zero hit points or below, you may cause twice the total damage amount to another creature of your choice just before going unconscious even if that damage is enough to cause you to die instantly.