Undying Soul

-Immune to being incapacitated

 

-Unable to roll death saving throws, but you are allowed to heal from negative health to positive health using a DC 14 medical check minus your constitution bonus. Whether this requires a healing item is dictated by the dungeon master.

 

-Once you drop below 0 HP, halve your movement speed and remove all proficiency bonuses except for medical

 

-On the turn where you drop below 0 HP, double your movement speed, disregarding the above penalty until after the turn

 

-Once you drop below this value [HP / 2 * -1], with a cap of -30, you are dead, unless a resuscitation attempt is made, with DC 18, minus half of YOUR constitution modifier, rounded up, and THEIR medical bonus. There are items, such as a defibrillator, that can improve this value. This is rolled by the Dungeon Master, but does require another player to resuscitate, unless the DM says otherwise.