Former Kohn-Ma terrorist who sought asylum on Deep Space Nine while secretly plotting to collapse the Bajoran wormhole.
Tahna Los is a former member of the Kohn-Ma, a Bajoran terrorist group that kept fighting after the Cardassian withdrawal. He arrives at Deep Space Nine pursued by a Cardassian ship and asks for asylum, claiming to have renounced violence, and Kira Nerys, who knew him from the resistance, vouches for him.
In Past Prologue, Tahna is secretly working with the Klingon sisters Lursa and B'Etor to obtain bilitrium explosives. His real aim is to destroy the entrance to the wormhole so that neither the Federation nor the Cardassians will have reason to stay near Bajor. Kira foils the plan and he is taken into custody.