As described by the backstory of Tinkado Mushameri -
The insane grandmaster of the blade Koguran escaped here before you. An old unbalanced man who has killed dozens of swordsmen in duels, seeks your death and the destruction of First Landing. He is jealous of your victories and wants to prove to he is the best swordsman in both worlds. He kills only to better his blade. No man can defeat his insanity.