Cyressian’s Soul Binding

You target two willing creatures who share a bond of true love within range and forge a powerful arcane tether between them that unites their very souls. You can choose yourself as one of the two targets when you cast this spell. While the two bonded creatures are on the same plane of existence, they gain a +1 bonus to their AC and all saving throws they make, and are considered immune to the charmed condition. Additionally, the targets always know the direction and distance to the other, and if one of them travels or is transported to a different plane, the other one automatically knows to which one.

The spell ends only if one of the bonded creatures dies, or through a Wish spell. A creature can only benefit from this spell once in its lifetime.