T'nag was an old enemy of the legendary Klingon warriors, Kor, Koloth and Kang. The three warriors once fought a glorious battle against T'nag and his force of forty legions, in which they emerged victorious. Following their victory, they killed T'nag and feasted on his heart. (DS9 episode: "The Sword of Kahless") Kor once held the Korma Pass against T'nag's forces. (DS9 episode: "Once More Unto the Breach"; TLE novel: The Art of the Impossible)