Legends say a long long time ago, there was an adventuring party. Within this party was Helgred, the Oath of Devotion Paladin and a very unlikeable Necromancer Wizard named Yashirocke. For better or for worse, those 2 got married after everything was said and done, being the last 2 remaining members of the party. Their devotion to each other could not be shown by any normal set of rings, so they made their own. These two rings were made of a platinum core and silvered coating. One bore the emblem of a skull, while the other bore the star of [insert forever lost religion here]. With the combined powers of the gods and necromancy, these became cursed rings that would later set the entire world into the "Till Death Do Us Part" precedent that we know today.

Requires 2 willing targets to wear and attune to the rings, cannot be removed from hand once attuned or using 9th level remove curse / wish.

+2 to AC when within 60ft of each other
+1 to all saving throws
if within 5ft of each other you may: use a reaction to take the hit, or at anytime sacrifice your own hit points when the other person takes damage (damage transfers in 1:1 ratio)
At will you know the location of the other ring bearer anywhere in the world so long as it's the same realm or setting. i.e. Eberron and the surrounding planets/planes, but not Forgotten Realms and Eberron.
Making an unarmed strike with the ring hand has the same effect of silvered weapons.

When 1 person dies, you both die. Being knocked unconscious has no effect.
When forcefully removing the ring by removing the body part, it magically transfers to another finger, then toes, and finally the neck. (Resizes to fit comfortably).

Notes: Bonus: Saving Throws, Bonus: Armor Class, requires a second willing person to attune