The floating fortress that Moo now uses as his headquarters was once a weapon used by the Pendant Civilization in the Final War. It crash-landed in the middle of their city, and lay underground until Holly's Father unintentionally unlocked Moo's soul and re-started the power grid. This grid holds the castle aloft. Most of it is carved from stone, and while the lower levels contain laser cannon weaponry and a hangar for the iron bird fleet, the middle section has large buildings for housing. The center tower is the control tower where several Weeds work, and at the top are Moo's private quarters, including his spacious throne room.
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Moo's Throne Room