Ollien was a male Human Commander of the Sith Empire living during the Galactic War. Stationed on Quesh during the Quesh war in 3642 BBY, Ollien became aware of a Republic strike force that was attempting to detonate a series of caverns under an Imperial command center. He sent the Sith apprentice of Darth Baras to deal with the problem and the Sith located and defeated Captain Trey-yen and his men just as they finished installing the explosives.