One of the Endless has Cursed or Blessed you, Granting you Strength beholden to Monsters and a thirst for a Vital Fluid or Energy all Mortals Posses, you lack this Vital essence and can only survive by sustaining yourself off the essences of others. Your Constitution is raised by 2 points to a maximum of 20. You gain Darkvision out to 60ft and can see normally even in magical darkness. You gain the Essence  Drain power allowing you to steal health from your enemies. Your Deathly Nature grants you resistance to the cold and you no longer require sleep or to breathe. You are magically bound to the one who changed you and cannot disobey their command. your appearance changes skin grows pale and fangs or claws grow with which you use to feed on the vital essence of others as your eyes glow in a color befitting your master. For each day you go without feeding from a living person or a fresh corpse your max HP is reduced by 5 and you suffer a culminative -1 to all rolls.