Thread of Fate

You choose a creature within range to become the "Heart" of the spell. Choose an additional two creatures that are within 45ft of the Heart to make a Wisdom Saving Throw or become linked through the red thread. Through the duration of this spell, whenever the Heart suffers any physical or magical damage, the creatures linked also take damage equal to half the amount.

However, should the linked creatures take damage external to the Heart's damage, the Heart recovers hit points equal to the amount they suffered that turn.

This bond can be broken through the use of Dispel Magic or Disintegrate spell of 7th level or above. Otherwise the link is unbreakable until the caster dismisses the spell or it ends after the duration.

Higher Levels: When cast with an 8th level spell slot or higher choose one additional creature to link to the Heart. Additionally when cast with a 9th level spell slot, you can choose one of the linked creatures to permanently become linked to the Heart. When this happens, the creature must make an additional Wisdom Saving Throw or it becomes completely loyal to the Heart. This can be ended through the use of a Wish spell.