Sonorus

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Sonorus was built by Tauil-Nogûlra, with a little help of his old Padawan: Yan Starkin. It was Tauil's transport, almost a house for the Jedi.

Droid
R7-T19 was bought in Coruscant by Tauil. It was a non-attached droid of Sonorus.

Bye, bye, Sonorus
When Tauil killed Dr. Edward Bilstein in Abo Dreth, his Master and Tauil's father, Lord Destructor, destroyed Sonorus for vengence. It wasn't rebuilt, but Zyk Arios came for rebuilding R7-T19.