During the battle of Orelious IX, Sar and his crew became trapped in a field of Aceton assimilators, where his vessel was rendered powerless. Unable to escape the Menthar booby trap, Sar succumbed to the inevitability of his fate by accepting responsibility for his defeat. He would commend his crew for their bravery and they would together die at their posts from the radiation poisoning.
Sar's ship would be discovered a millennium later by the crew of the USS Enterprise-D. Upon succumbing to the effects of the Aceton assimilators themselves, the Enterprise-D crew used Sar's logs to better understand their situation. (TNG: "Booby Trap")