The counterpart of the Wizard Rune. It takes the half of your physical defense and adds that value to your attack strength. Whenever you have some defense to spare - and most of your good fighters should - attach a Warrior Rune to one of their hands for a great boost in offensive power. You can even combine this with similar runes like the Kindness Rune or Friendship Rune for massive stat upgrades or take a Killer Rune along and build great damage dealers.
The Warrior Rune is hold by Twaikin and Shiba for all times, in case you've wondered why these two guys deal more damage than usual. More crystals can be found sometimes on several shops. During the Fall of Kooluk, Haruna sells the Warrior Rune for 30000 potch, so take your chance and buy a few for your strongest killers. - Celes