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The Siege of Lasan was a battle fought between the planet's inhabitants and the Galactic Empire, which saw the near-extinction of the Lasat species. Following an uprising on the species' homeworld of Lasan, Agent Kallus of the Imperial Security Bureau was tasked with wiping out the rebellion. It was he who ordered the Imperial soldiers to use T-7 Ion Disruptors against the Lasat. After defeating a member of the Lasan High Honor Guard, the guard then gave him his AB-75 Bo-Rifle as a sign of respect. A number of Wookiee soldiers also took part in the battle, sacrificing their own lives to try to prevent the massacres on Lasan. Thanks to the Wookiees' intervention, some Lasat were saved. Among the Lasat who survived were Garazeb Orrelios, Gron and Chava.
After the Fall of Lasan, the Imperial Senate banned the use of the T-7 disruptors. However, the Empire secretly planned to acquire some of the last remaining stock to restart production of them on Lothal.