Divine Sign
With this ritual, the Pisanob Necromancer may use the principles of Aztec astrology to divine a person's day sign. Used upon the living, this information allows the Necromancer to divine the target's future actions. In the dead, this knowledge forges a more intimate connection with the target, making it easier to cast other necromantic effects on her.
Upon learning a person's birth date, the Pisanob's player may roll to activate this ritual in order to cross-reference it with the Tonalamatl, the Book of Destinies, and thereby learn that person's day sign. If successful, the Kindred may use this to predict the target's next course of action, allowing him to deal with it accordingly. the effect on wraiths is quite different. As they have already died, the Tonalamatl can offer no insight into the spirit's destinies, which have already run their course. Instead, the ritual imparts upon the Necromancer so intimate an understanding of the wraith in question that it acts as a connection to the ghost, making it easier to invoke other Necromancy effects on that spirit. For story purposes, it's equivalent to holding one of that wraith's fetters (see Ritual of the Unearthed Fetter on p. 165 of Vampire: The Masquerade for details).
Reference: CGR 72
