Great Spirit Forest Aharthern

Great Spirit Forest Aharthern (大精霊の森アハルトヘルン, Dai Seirei no Mori Aharutoherun) is the world where the spirits live. Its whereabouts change over time and can only be found by following rumors of the Great Spirit Forest.

History
2,000 years ago, Anos Voldigoad and his army invaded Aharthern with the intention of finding the Great Spirit Reno. With the defeat of its guardian, the Great Spirit Liniyon, the demon army was able to set the whole forest ablaze in order to draw out Reno.

Some time after Anos sacrificed himself to cast Four Worlds Wall , an amnesiac Melheis Boran found himself in Aharthern, possibly trying to escape from whomever erased his memory.