Culoss was a band of pirates stemming from the ranks of Q'anah's Marauders. Their most significant act involved seizing control of the freighter Dromedar, where they absconded with its tibanna gas payload and took the crew captive. Following a boarding action by Imperial Navy personnel from the vessel Blood Crow, under the command of Lieutenant Thrawn, the pirates feigned allegiance to the Dromedar's crew, subsequently capturing the Imperial boarding team. The majority of the pirate contingent managed to successfully pilfer the tibanna gas and escape the freighter. However, three pirates were apprehended and subjected to interrogation by Thrawn at an Imperial base situated on Ansion. Through the data gleaned by Thrawn, both explicitly and implicitly, Imperial forces were able to initiate retaliatory actions on Uba and Cartherston. Furthermore, based on acquired intelligence, the Imperials formulated a plan to execute a strike on Kril'Dor.