The Y-Data is information described as the "Root of the Miltian Conflict". It is said to be the entire log of Joachim Mizrahi which comprised his entire research especially regarding the Zohar among many integral events and components in the series including the Gnosis phenomenon and the location of Lost Jerusalem. It also includes the access codes to the UMN transfer column for the Old Miltia sector, which have been lost since the conflict. During the Miltian Conflict, Jin Uzuki stole a copy of the Y-data from U-TIC, likely from Margulis, and downloaded it into Canaan. However the data was encrypted and could only be accessed within Labyrinthos. For 14 years the Miltian government worked endlessly to decode it to no avail. Another copy was hidden within MOMO. Several people, including Juli Mizrahi, Joachim's wife, had no knowledge that the copy existed within her. MOMO's copy of the Y-data features a safeguard that the Ormus cult, namely Albedo, had to bypass in Episode II in order to extract the information he needed to locate the Abyss. According to Wilhelm, the data extracted from MOMO by Albedo was incomplete.