Arca Silentus
From Warhammer 40k - Lexicanum
The Arca Silentus (sometimes spelled Arca Silentia), was a massive forge-station dating back to the Dark Age of Technology active during the Horus Heresy.[1a]
A titanic structure similar in size to a small moon capable of endlessly replicating Automata and automated attack satellites indepently, it was deployed into the Oort Cloud by Rogal Dorn during the Heresy in preparation for Horus' arrival in the Sol System.[1a] However the station was corrupted by Lukas Chrom's Scrap Code emitter on Mars, forcing a Custodes boarding party and later Dark Angels reinforcements to destroy it after a bloody battle against its corrupted constructs.[1b]
