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Mohs was an aged and stooped Sharu male belonging to the Toka culture. He was the High Singer of the subintelligent Toka, and he knew all their legends about the ancient, advanced, and supposedly extinct Sharu species. Mohs lived in the city of Teguta Lusat on Rafa IV. After Lando Calrissian was tasked with finding the legendary Mindharp of the Sharu by Rokur Gepta and local governor Duttes Mer, Mohs encountered him in a local bar, the Spaceman's Rest. He attempted to steal the Sharu artifact known as the Fabled Key from Calrissian's possession, but was unsuccessful. Agreeing to help Calrissian find the Mindharp on Rafa V, Mohs instead betrayed him to the local Toka. He was ritually forbidden from killing Calrissian, and so he tied him to a tree in one of Rafa V's life-orchards.

After Calrissian escaped both death from exposure and the intelligence-sucking life-orchard, Mohs showed the adventurer and his droid companion, Vuffi Raa, where to find the Great Lock set into the largest of the Sharu pyramids. When Calrissian, Raa, and Mohs entered the pyramid, its Sharu technology caused Mohs to grow to sixty times his original height and mysteriously lose his sight. In the Sharu pyramid, Mohs began to regain some of the intelligence that had been stripped from him and the rest of the Toka in the distant past. While Calrissian and Raa were still exploring the pyramid to find the Mindharp, Mohs abandoned him and returned via Sharu technology to Rafa IV, where he began making preparations for Calrissian's return.

Four months after he entered the pyramid, Calrissian discovered the Mindharp and was transported back to Teguta Lusat. Betrayed by Vuffi Raa, he was forced to surrender the Mindharp to Duttes Mer, who attempted to access its secrets. Mohs waited for Calrissian inside the starship Millennium Falcon and encountered the gambler again there. The Toka man revealed himself as a Sharu and explained that because the Mindharp had been played all the Toka were becoming Sharu again. Mohs then left Calrissian's starship before the Millennium Falcon fled the Rafa system.