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In the castle dungeon, there was a level 5 Sylvan, whom I immediately sent on difficult missions in the nearby area (pirates, marks). At level 6, she learns Earth Magic, levels up, and at level 121, I take the second-tier castle with a growth spell. In the meantime, I built teleportation houses on level 117. Then, I expanded to other zones and overwhelmed the opponent with a large army on the Grove.
Thank you for the game.