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Sun Fort (太陽(たいよう)(とりで)) is an ancient fortress in the Ancient Battlefield in east Crossbell. Like the Moon Temple and Stargazer's Tower, the Sun Fort was built before the Middle Ages (c. S.700). It served as a fortress during the countless wars between Erebonia and Calvard over the territory now known as Crossbell.

Its enormous bell was removed during an investigation in S.1185, which can now be seen at the center of Crossbell City.


After authorities destroyed the D∴G cult in S.1198, the survivors found new shelter in the Sun Fort. They found the laboratory once established by the Crossbellan alchemists and put its high-tech facilities to use. This is where Joachim Guenter completes his work on Gnosis.


The Sun Fort features a hallway that reaches 500 arge deep into the earth. For the Cult this spacious shaft represented a path toward Gehenna.

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