In 9 ABY, Imperial scout ships, directed by Grand Admiral Thrawn conducted an information raid on Obroa-skai's extensive library. An Elomin task force, patrolling the system as part of the New Republic's diplomatic efforts to bring Obroa-skai into the Republic, gave chase and followed the scouts into hyperspace.
- Heir to the Empire (First mentioned)
- Heir to the Empire Sourcebook
- Dark Force Rising Sourcebook
- The Official Star Wars Fact File 5 (THR3, Grand Admiral Thrawn)
- The Official Star Wars Fact File 97 (THR1, The Thrawn Campaign)
- The Essential Atlas (First mentioned)
- The Essential Reader's Companion