Grand Tree dungeon is located under The Grand Tree in Tree Gnome Stronghold. It is first entered during The Grand Tree quest when a player revelas a hidden ladder by pressing a Stone stand in the Watch tower above Gloughs house. Upon entering in the quest Glough will summon a Black Demon. After the demon is killed player is asked by the King Narnode Shareen to find a Daconia rock by searching the roots in the dungeon.
After the quest the dungeon is mostly used for the Tree Gnome Stronghold mine in the north. The mine is accessed by pushing aside the roots.