Hulle Granz Cathedral or Grima Raef Cathedral (グリーマ・レーヴ大聖堂) is a field located at Δ Hidden Forbidden Holy Ground. It is one of the Lost Grounds, and may have functioned as a Root Town and a minor event location in Fragment, the beta version of The World. Hulle Granz is a unique field, in that it consists only of a small island with a large cathedral in the center located in a lake of mist. The area's Fragment keyword was "Navel of Lake", and it is said to be an important place from the Epitaph of Twilight. Hulle Granz is the site of many important events in both Project .hack and .hack Conglomerate. Its name means "That Which Hides Heaven."

(Epitaph of the Twilight: Hulle Granz Cathedral, located on the island at the "navel" of Alba's Lake, was already ancient beyond memory when the King of Light, Apeiron, and the Queen of Dark, Helba, met there to forge their unlikely alliance against the Cursed Wave in the opening scene of the Epitaph. It is also where the combined armies of Light and Dark, along with an army of humans, made their last stand against the Cursed Wave, since it was said that the Twilight Dragon would come here once it was found.)

(The World R:2 History: Hulle Granz is where humans trapped the Goddess of Light, Aurora..)

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