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The Underworld[1] is a sub-level kingdom of Mewni ruled by the Lucitors, Tom's family, and inhabited by demons. It is seen in the opening as Star and Marco travel through various dimensions, and makes its first official appearance in "Blood Moon Ball".

The Underworld holds the Blood Moon Ball every 667 years.


The environment is rocky, covered in flames, stalagmites, and stalactites, and seemingly underground. In Star and Marco's Guide to Mastering Every Dimension, it also has a castle from which Tom's family rules from.



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