The B-4D Legion represented a bomber design manufactured on the planet of Sernpidal's shipyards for the revived Sith Empire. Functioning mainly as a drone bomber, the Legion employed missile sentry drones, laser cannons, and proton torpedoes to engage targets, seeing action with Imperial units throughout the duration of the Galactic War against the Galactic Republic.
Within Star Wars: The Old Republic: Galactic Starfighter, a Digital Expansion from 2013 for the video game Star Wars: The Old Republic, the B-4D Legion appears as one of four bomber types accessible to Imperial players. Unlocking it requires 5,000 Fleet Requisition, and it serves as the drone bomber for the Imperial side, capable of launching repair, missile, and sentry drones. The Warcarrier is its equivalent within the Republic forces.