The Kaleidoscope Necropolis

The Kaleidoscope Necropolis is a series of difficult quests in which you can fight powerful bosses one after another. Powerful armaments can be collected by clearing quests.

Each element has three quests available of increasing difficulty. Completing a quest on one difficulty will unlock the next difficulty.

Upon clearing the Main Quest World 4, the "Door to the Depths" quest will become available. Clearing this quest will unlock the first level of each element's Depths.