Kathos served the Queen for years and years, as Ligoria rose to become the greatest empire the Storm Coast had ever known. He became the queen's general, and served her during the invasion of the motavi empire and many other battles, notably the conquest of Lechem and Dalannor. He ended his career after the Siege of Fiumefurt, which lasted four years; by then he was an old man, a shadow of the warrior he had been in the years of his youth. In his retirement years, he saw the Queen grow evil and corrupted, and at first he stood by, torn between a loyalty that he had promised he would never break again, and the sense of justice that had lead him to Ligoria.
When at last he made his choice, it was too late. The first and the greatest of all rebellions was led by him, but in the end, he could not kill the Lich Queen. Many stories speak of his death, and no one knows for sure how he died; some say he was pierced by arrows during the siege of Talama, and did not witness the ultimate defeat of his rebels, who managed to take the walls but not the city; others whisper that he is one of the few who managed to get inside, and that he even met the Lich Queen in battle as his forces were being pushed back out of the city. In his earlier years, Kathos had been the finest swordsman of the kingdom, never defeated in single combat; however, now he was an old man, and his last task proved to be too much for him, and he died at the end of the Lich Queen's sword. A more rational man would have fled the city to lead the rebellion, but as he liked to say, "Kathos Thunderblade does not run."
He left behind him a strange legacy; in his young years he created a genocide in a mad quest for vengeance, then created a kingdom led by his nephew. While he grew older, he served the Lich Queen as she conquered the west of the Storm Coast, and as she grew crazy in her immortality... And finally, in his old age, he rose in rebellion against her, but in the end he failed to stop her. In the south, he would be forever be remembered as a monster and a destroyer of nations, the Black Knight of the Seventh City; in the north, his legacy would be that of an hero and a martyr, the Storm Lord of the Islands. He was buried far away from his homeland and his family, but at last in peace.
Dalannor and Lechem, which had been his lands, remained independent of the empire after the rebellion, thanks to their fleet, but they failed to threaten the Lich Queen's rule.
Kathos' sword was never found, neither in his tomb or in the Queen's possession. An urban legend states that his second in command, Adrian, took it from his commander's body and brought it back to his kin.