Tadaka's Gift

Tadaka's Gift was a Mastery 1 earth spell created by Isawa Tadaka before his journey into the Shadowlands so that his love, Shiba Tsukune, could watch over him from distance. The caster enchanted two stones of the same material so that they became magically linked. The carrier of each stone always knew the general state of the other stone's bearer. The carrier also knew if the other bearer no longer carried the stone, or if a different creature now carried it.