This ritual was originally devised by the Kitsu sodan-senzo, but due to its widespread applicability it quickly spread to other shugenja families and schools. The Kitsu wished all Rokugani to properly venerate the ancestors, and thus had no difficulty sharing their discovery with the Isawa and the other clans as well. For those who do not have Kitsu blood, this spell is one of the very few ways in which shugenja can actually communicate with the ancestors while in Ningen-Do.
The spell is actually an hour-long ritual prayer which can only be performed in the company of a recently deceased individual's relative within twenty four hours of the funeral (which both the shugenja and the relative must have participated in properly). Other shugenja may assist in the ritual if they also know the spell; they do not need to make Spellcasting rolls, but are still considered to use up a spell slot. Once the prayer is properly completed (a successful Spellcasting Roll by the lead shugenja), the caster and the relative may both converse for a few minutes with the spirit of the recently departed. (If extra shugenja assist in the ritual, each assisting shugenja adds +1 minutes to the duration of the spell.)
Typically, this ritual is only used in situations where the living relatives want to make quite sure they are properly remembering and honoring their newly-departed ancestor. The exact results of communing with the departed relative are at the discretion of the GM, but could include learning important information, receiving advice and guidance, or taking up a task which the dead samurai left incomplete.