Yumi is the name of a weapon Kalen holds in secret. Believed to only be a myth, Yumi is a weapon whose form is determined by the willpower and imagination of its wielder. This gives it the nickname the Imagine Blade. Kalen will only ever use the weapon when in times of true crisis. To keep others from suspecting he may be in possession of Yumi, he disguises it as a decrepit old katana.