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Within the Necromancer's Undead Labyrinth, a larger landscape than the exterior suggested laid inside.
Enormous and eerie forests covered in the darkness of an artificial night, accompanied by the dim light of the moon.
Dungeons were not only enormous buildings that harbored monsters inside, but many of them were able to recreate spaces inside of them that could not even resemble how they looked outside.
Some could develop arid and hot deserts, while others could develop icy and landscapes filled with snow and winter, and some others were even able to recreate beautiful forests filled with fauna and a warm sun atop the skies.
Such 'worlds' were artificially created biomes within dungeons, whose creation was deeply related to the dungeon's quality and the Mana that harbored within it.