Vagaari

The Vagaari were a sentient species that resided in the Unknown Regions and would modify technology of the alien species they conquered. The species put their prisoners in pods on their warships' hulls to discourage counterattacks. Around 27 BBY, Senior Captain Mitth'raw'nuruodo, core name "Thrawn," of the Chiss Ascendancy stole a gravity well projector from Vagaari pirates, marking the start of the senior captain's Vagaari pirate operations. The operations ended with the Vagaari's defeat.

In 18 BBY, the Chiss Syndics Irizi'stal'mustro and Mitth'urf'ianico confirmed rumors of an alliance between the Vagaari and the Paataatus, an Unknown Regions species. Thrawn was subsequently sent to the Paataatus homeworld of Nettehi to confirm the rumors. The Chiss discovered that the rumors were false, and a Paataatus Prince Militaire told the Chiss where he could find a remnant of Vagaari pirates, which Thrawn attempted to track down.

Text and facts from the “Vagaari” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.