A massive-scale total conversion based on the New Republic and New Jedi Order eras, and the Star Wars Expanded Universe.
The Heart of Artorias, originally Tsam P'ah, was a Yuuzhan Vong slaveship used to house captured sentients from Artorias and other planets.
Once the slaves rebelled and took control of the vessel from their Yuuzhan Vong captors, the ship, piloted by Nina Galfridian, became the flagship of the nascent Outer Rim Alliance - a confederation of New Republic, Imperial, pirate, smuggler and civilian forces joined together to defend the people of the Outer Rim.
Unlike other conventional New Republic subfactions which can build their units from their planets/territory, the ORA subfaction is accessed entirely through the 'Heart of Artorias' which can summon ships from the Alliance to aid it in battle.
The semi-randomised selection of ships which might be called in range from Bulwark III battlecruisers, and Watchkeeper, Imperial and Republic-class Star Destroyers, all the way down to freighters and transports.