Cassel, a Pantoran male, held the position of Monarch for the planet of E'ronoh in the High Republic Era. People often considered him lacking in intelligence. Alongside Thandeka, who was the queen consort of E'ronoh's sister planet, Eiram, Cassel was abducted by the Directorate as part of a plot designed to destabilize the region's governing bodies. When Lord Isamer, a leader within the Directorate, grew furious with his lieutenants upon learning they had kidnapped Thandeka instead of Dima, the actual queen of Eiram, Cassel interjected, stating that Dima would still desire the return of her consort. Thandeka then accused Cassel of trying to side with their abductors, but Cassel defended himself, asserting that he was contesting Isamer's assessment of Thandeka as worthless. During the rescue operation executed by the Jedi to free the hostages, Isamer was able to aim his blaster at Thandeka. However, before he could fire and kill her, Cassel bravely jumped in front of the blaster fire, saving Thandeka's life at the cost of his own, succumbing to the blaster wound.