Most likely the first rune you'll encounter by playing the Suikoden series in order of appearing. The Boar Rune owns its name a wild boar it resembles. Used only by claw and glove-weapon fighters, or those who attack with bare fists, it unleashes a series of strikes onto the target. There exist just a few characters who are able to wield this rune.
The Boar Rune has its drawbacks. The crystals scattered around the Toran Region will cause the character to become unbalanced in the next turn. However, by dealing twice the damage in one round he is still able to throw items or defend himself, giving you a slight advantage for practical purposes. Pahn is well known for his permanent attached Boar Rune and more crystals can be found and brought into battle with Morgan or Eikei. During the events of the Sun Rune War another of these runes was equipped to Nikea, but this time it lowers her accuracy for the rest of the battle and can only be used once per fight. Though the painful attack hits with triple damage here. - Celes