The Hand Your Delt
This rule allows characters to heal up in the thick of combat and works well for parties that
feature few or no characters with healing magic, or for campaigns in which magical healing is rare.
As an action, a character can use a healing surge and spend up to half his or her Hit Dice. For each Hit Die spent in this way, the player rolls the die and adds the character’s Constitution modifier. The character regains hit points equal to the total. The player can decide to spend an additional Hit Die after each roll. A character who uses a healing surge can’t do so again until he or she finishes a short or long rest. A character regains all spent Hit Dice at the end of a long rest. With a short rest, a character regains Hit Dice equal to his or her level divided by four (minimum of one die).