The following an easy way to defeat the final Boss in the game. Have good armor and maxed out weapons for your party. Have everyone in your party at level 65 or above, and one of the four be Ted. For Ted, have a Wizard Rune. For Hero, have a Double-Strike Rune. The other two should have a good magic user with a Water Rune for healing, and another hard hitter such as Lino En Kueldos. Focus first on the two seeds due to the fact they will heal the giant tree. After killing them, use Ted's best spell on the tree for two rounds. Then, use his spell of 600 damage every round after that. Use your Water Rune to heal from time to time and have your two fighters attack every round. The tree should die quickly.