The Conduit on Ilos, activated during the Battle of Ilos.

"Eden Prime was a major victory. It has brought us one step closer to finding the Conduit."

— Saren Arterius.

The Conduit was a prothean-built prototype mass relay constructed in the final century of the Prothean war with the Reapers. It served as the first known case of a mass relay being built by a below-Tier IX species. The Conduit was built on Ilos, but was eventually claimed and removed by the Dominion and taken to Earth, where study on it allowed the creation of their own mass relays, with the Systems Coalition constructing Conduit II in 2218 CE, and the quarians and geth later with Conduit III in 2221 CE.