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The '''Praeses Mercatura''' is the military arm of the [[Merchant Fleet]] of the [[Imperium]].{{Fn|1}} Clad in midnight blue armed forces, of the {{PAGENAME}} ultimately answer to the [[Speaker for the Chartist Captains]] and they protect the Speaker's personal domain on [[Terra]], known as the [[Nexus Axiomatic]]. The Mercatura's formation dates back to the aftermath of the [[Siege of Terra]], where the Nexus was nearly destroyed before [[Horus]]' forces were defeated. To ensure that never happened again, the Speaker created the Mercatura and armed them with ancient weaponry and technology, to wield in the rebuilt Nexus' defense.{{Fn|1}}