The Praeses Mercatura is the military arm of the Merchant Fleet of the Imperium.

贸易守护者是帝国商船舰队的军事武装。

Clad in midnight blue, the Praeses Mercatura ultimately answer to the Speaker for the Chartist Captains and 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.

覆深蓝色的贸易守护者最终向宪章船长发言人负责，并保护发言人在泰拉上的个人领地，即公理枢纽。守护者的形成可以追溯到泰拉围城之后，在荷鲁斯的部队被击败之前，枢纽几乎被摧毁。为了确保这种情况不再发生，发言人创造了守护者，并用古老的武器和技术武装他们，在重建的天枢的防御中使用。

The Praeses Mercatura are a lightly armed force designed around protection and internal security, with its infantry wearing little armor and being armed with Lasguns and Laspistols. They also utilize gunships and Gun-Servitors.

贸易守护者是一支轻型武装部队，围绕保护和内部安全而设计，其步兵穿着少量盔甲，装备有激光枪和激光手枪。他们还使用炮艇和枪炮机仆。