Hephaestus Index

The Hephaestus Index is a weapons development database that the Vanguard finds references to in the Bray archives during the Hephaestus adventure in Warmind, set in the BrayTech Futurescape on Mars. Zavala warns that enemies with access could reverse-engineer dangerous ordnance, so the Guardian destroys two data terminals at his request.

Ana Bray then asks for a copy of the Index. The Guardian hacks two backup server shards to recover the deleted data and defends the main terminal from the Hive while it is reassembled and sent to her. Ana later says the Index is "safely offline" and can be used to recreate Golden Age technology.