Hit me baby one more time

You can take a beating. 
Whenever an enemy hits you with a multi attack or a regular attack, you can use your reaction to force the enemy to try and attack you one more time but if they hit you you gain the damage as temporary life points instead. However If they miss you, you take the damage as usual plus another one (so if the damage is 1d6 you get hit with 2d6 instead)