Deadly Connection

You touch an unconscious person (NPC or PC) that has two or less death saving throws remaining. At the cost of your own life force, your HP is drained to 0 and you're knocked unconscious. This person now has 3 extra death saving throws, but once they're out of total saving throws, you both die. If you die, they die.

Be very cautious with this spell. All of your death saving throws now belong to your connected person, so if you get hit, you and your connected person die. 

This connection only ends upon either person's death. There is no other way to break or counter the spell, regardless of level.