The Avatar was the personal Star Destroyer of Grand Admiral Rufaan Tigellinus.
Behind the scenes[]
Dan Wallace originally named the Avatar in a segment of his Grand Admirals article Who's Who: Imperial Grand Admirals that was cut; the name was officially applied in a later article.
Sources[]
Grand Admirals: What Have They Got in their Pocketsses? on Continuity, Criticisms, and Captain Panaka — Daniel Wallace's StarWars.com Blog (original site is defunct)
Underworld Appendix: Swoops, Spice, and Wretched Rogues on Hyperspace (article) (content obsolete and backup link not available)
In other languages