However, by 20 BBY, the Separatists, at the request of the Quarren, sent Commander Riff Tamson as an ambassador and observer to Mon Cala. Kolina then asked the Republic and Jedi to help him keep his world from descending into a civil war. Kolina was then assassinated by Tamson, who had been promised rulership of the planet by Count Dooku. Lee-Char later killed Tamson, avenging his father's death during a large battle, a coronation was later held for him, where he was crowned king with the support of Nossor Ri.