History of Archimedes Annex

Overview

The Archimedes Annex is an annex from Season of the Seraph that sits inside the Seraph Facility at Twilight Gap. It is where a cryptographic index is recovered for the "Should You Choose to Accept It" quest line, which rewards catalyst traits for the Revision Zero Exotic Pulse Rifle.

Location

The wiki's Part III entry says the annex is reached through the Warmind Launch Facility icon on the H.E.L.M. map in the Director.

Quests

The index is downloaded in Step 1 of Part III, which unlocks after Week 6 of the "More Than a Weapon" quest and follows Part II. The index is then used in later steps that send players to the European Dead Zone and to a dead drop in Terminus East.

Some 2022-era guides list the Diocles Annex instead for Part III, so check the in-game quest log if the location does not match.