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Precursor relics are technologies developed using the the knowledge and technology of the Isu, whose functions do not revolve around controlling and influencing the minds of other individuals.
Notable Precursor relics include the Memory Seals, capable of being infused with select memories of their users, and the Masyaf Keys employed by the Assassin Mentor Altaïr Ibn-La'Ahad for his library. Though not developed by the Isu themselves, the Book of Abraham Eleazar, written by Nicolas Flamel, and the Voynich manuscript demonstrate humanity's potential to replicate Precursor technology. Nevertheless, such human products of Isu technology, like the latter, generally require an Isu device such as a Precursor box in order to function properly.
- In Assassin's Creed: The Essential Guide, the entry for "Precursor Relic" is misspelled as "Recursor Relic".
- From the wording of Assassin's Creed: The Essential Guide, it is unclear if the term "Precursor relics" also encompasses objects created by humans on the level of their technology, such as the Book of Abraham and the Voynich manuscript. These human-made artifacts are described under the entry for "Recursor [sic] Relics", but the way they are introduced, as objects "not rightfully Precursor technology" may suggest that they are being mentioned offhand for their similarities rather than as Precursor relics themselves.
- Despite the fact The Essential Guide distinguishes Pieces of Eden from generic Precursor relics by their ability to manipulate the minds of individuals, the book also counts the Koh-i-Noor and the Grand Temple Key among Pieces of Eden. It is also not entirely clear if Precursor relics are defined by their lack of mental manipulation abilities or is a general term for any Isu technology, of which Pieces of Eden are a subclass.
- Assassin's Creed: Project Legacy
- Assassin's Creed: Revelations
- Assassin's Creed III
- Assassin's Creed III: Liberation
- Assassin's Creed: Rogue