The Akashic Records hold godlike power over the system of The World. Chrono Cores are used to control the Akashic Records, which can even alter past data. Schicksal's goal seems to be to take the Chrono Cores entrusted to Kite and his friends in order to take full control over the Akashic Records.
They are first mentioned in .hack//AI Buster by Watari in a conversation with Saki
They are first mentioned in .hack//AI Buster by Watari in a conversation with Saki