The Mraz was an Executor-class Star Dreadnaught that served as the flagship of several Jedi allied fleets over it's lifetime, primarily serving as the command ship and main defensive starship of the Yavin IV Jedi, as a part of the Yavin 4 Defense Force and it's successor, the Jedi Peacekeeping Taskforce. In 49 ABY it received an upgrade to it's Hyperdrive systems, increasing it's top speed to a mark 1.5 Hyperdrive. This was in preparation for it becoming one of the flagships of a more mobile Peacekeeping Taskforce.