Trade of Life

You can either heal a creature for a certain amount of hitpoints, bring them out of their condition (i.e. paralyzed or petrified), or both- for a cost. If you try to heal or remove somebody's condition, you have to roll a d20. 10 and below,  the target is healed but you suffer. If you healed 11 hitpoints and unparalyzed them, then you take 11 damage and get paralyzed. If you roll 11 or above, then the healing happens but you don't get any negative conditions. Furthermore, if you roll a one, then the target isn't healed and you take the damage and conditions you were trying to remove. But if you roll a 20, the positive effects go to both you and the target.