This castle can be considered a mobile fortress, designed by Doble Zeta to replace Gundam Castle, which was destroyed in a battle with the Dark Army. It took ten years to build, and its power source is an eternal ember that exists in the "Fire Mountain." When attacking, it deploys the artillery on all four sides and moves the castle tower backwards to transform into fortress mode. The mock battle held at the completion of Heaven and Earth Castle later became a legendary battle known as the "Battle between Heaven and Earth."