Arche Koeln Waterfall (アルケ・ケルン大瀑布) is a field located at Δ Hidden Forbidden Radiation. It is one of the Lost Grounds and its name means "The Land of Origins".

(The World R:2 History: When humans were fighting against the "Shadow", this is where a young apprentice magician called forth the gods.)

(Epitaph of Twilight: Arche Koeln lies in the "Land of the Beginning of Beginnings". Within the Temple of Arche Koeln, past its waterfall seal, is the entrance to the path leading to the End of Land. This is also mentioned as the place to which power returns.)


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