Progressing to the deepest level is required for the quest "Get a Lode of This," where you must collect a Geological Sample for characters like Giva or the Farseer.
To venture into the lower depths of the mine (levels 15–20), you must complete specific narrative milestones:
Unlike earlier floors where you simply find keys under rocks, you must receive the "Deep Mine Key" from the High Priestess during a Summer Coven quest.
One of the deepest features in Wylde Flowers —both literally and mechanically—is , specifically the progression into its lower levels to unlock the "deep" story of Fairhaven's history.