Heart to Heart

1st-level necromancy
Casting time: 1 action
Range: Touch
Target: you and the creature you touch
Components: V, S, M (a drop of your blood)
Duration: 1 hour
Classes: Bard, Paladin, Sorcerer, Wizard
Subclasses:

For the duration, you and the creature you touch remain stable and unconscious if reduced to 0 hit points while the other has 1 or more hit points. If you touch a dying creature, it becomes stable but remains unconscious while it has 0 hit points. If both of you are reduced to 0 hit points, you must both make death saving throws, as normal. If you or the target regain hit points, either of you can choose to split those hit points between the two of you if both of you are within 60 feet of each other.