While Clay was directly involved with helping Montgomery, Archimedes was instead part of "The Rogues", Clay's team of undercover operatives. He then betrayed Clay when he accepted Aurelia's offer of the Eden-7 system (more specifically, two planets and enough cash to build a waterslide between them). By then, he faked his death, joined the Children of the Vault, and became part of the Anointed.
Archimedes is encountered during the main mission Going Rogue and presents as the final boss of the mission with the Vault Key Fragment inside him.
- Main article: Going Rogue
- Unlike other anointed enemies, Archimedes will automatically shatter when he is defeated.