ユーフラニア諸国の１つ。君主を『大公』と呼ぶ国の１つでもある。 神聖アウロラ王国の近くに位置する（Book32の地図より）。
歴史的に領土的な野心が強いと言われ、周辺諸国から警戒されている。 また、大災厄時代にはプトレメウスの施政によるものか、各国と比べて殆ど無傷のまま、アウロラより豊かな国へと発展している。 プトレメウスがルシーヌに喰われた後、大公位を誰が継いだのか、その後のオレニアがどうなったのかは定かではない。
2F WEST 2F NORTH-1 2F EAST-1 1F WEST 1F SOUTH-1 1F SOUTHWEST-1 1F EAST-1/1F SOUTHEAST/1F EAST-2 BASEMENT EAST BASEMENT CENTER BASEMENT NORTHEAST BASEMENT NORTH BASEMENT SOUTHEAST BASEMENT SOUTH 2F SOUTH/2F SOUTHWEST-1 1F NORTH-1 2F NORTH-2 2F EAST-2/2F NORTHEAST 2F SOUTHWEST-2 BASEMENT SOUTHWEST-1 BASEMENT WEST-1/BASEMENT SOUTHWEST-2 1F SOUTH-2/1F NORTH-2 3F SOUTHWEST 3F WEST 3F NORTH-1 3F CENTER 3F EAST 3F SOUTH/4F SOUTH 4F EAST 4F NORTH ROOF CENTER 3F NORTHWEST 2F SOUTHEAST-1 2F SOUTHEAST-2 1F NORTH-3 Break Time 1F SOUTHWEST-2 BASEMENT NORTHEAST-2 1F SOUTHWEST-3 4F WEST-1 Break Time-2 BASEMENT WEST-2/2F SOUTHEAST-3 3F NORTH-2 BASEMENT WEST-3 BASEMENT NORTHWEST-1 BASEMENT NORTHWEST-2 BASEMENT NORTHWEST-3 BASEMENT NORTHWEST-4 4F WEST-2 1F SOUTH-3 LAST MISSION
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