It was a synaptic pattern displacement technique that only trained members of the Vulcan people, such as the High Priestesses of Mount Seleya, are capable of accomplishing. The purpose of the ritual is to reunite the katra of a Vulcan with their body. The ritual is considered very dangerous to perform and has therefore been done only in a very few cases. This is because of the fragile state of both the recently deceased person and the keeper of the katra itself.