Impulse of the Dammed

As a reaction, you can save an ally of your choice within 15 ft. of you from a killing blow.  Any kind of attack toward your ally from any enemy will automatically transfer to you upon you activating this feat.  You automatically fail one death save (even if you're not unconscious) and receive double the damage that was going to be inflicted on your ally.  You also have disadvantage on every attack you make for the rest of combat.  All of your allies involved in combat receive a point of inspiration and your saved ally succeeds on one death save.  Because Impulse of the Dammed can be used once per fight if you use this feat more than once before taking a long rest, you take a point of exhaustion.