Flesh Symbiont, Heart

Wondrous item, rare
  This symbiont is the abominable side product of a crazed necromancer’s arcane experimentation. Brimming with eyes and teeth, this beating lump of flesh vaguely resembles a humanoid heart.
  Revive. As an action you can press this heart to the chest of a humanoid corpse within reach. The heart burrows into its chest, consuming any existing heart that may still exist. Over the course on an hour, it grows to resemble the original heart, casting raise dead on the creature, requiring no material components..
  Curse. The symbiont’s dark nature and fear of light causes you to gain resistance to necrotic damage as well as the Sunlight Sensitivity and Symbiotic Vigor properties (see below). Casting remove curse on the heart causes it to rot, killing its host, and removing the resistance and properties conferred by the curse. Surgically removing the heart renders the host unconscious until it finishes a long rest, at which point the heart magically grows back.
  Sunlight Sensitivity. You have disadvantage on attack rolls and on Wisdom (Perception) checks that rely on sight when you, the target of your attack, or whatever you are trying to perceive is in direct sunlight.
  Symbiotic Vigor. This property of the heart only works while you are not in direct sunlight. The heart has 6 charges, and regains 1d6 charges when you finish a long rest. These charges manifest as 6 lidless eyes appearing on random locations across your body. While the heart is inside you, you can, as a reaction to taking damage, expend 1 charge to cast the false life spell, gaining the temporary hit points immediately before you take the triggering damage. Whenever you expend a charge, one of the eyes closes. Constitution is your spellcasting ability modifier for this feature.