広大で美しい世界を舞台に、プレイヤーが思うがままに冒険が楽しめるファンタジーRPG。メインクエストをマイペースに進めたり、無数にあるサブクエストを引き受けたりと、遊び方は自由自在。ゲーム中に登場する1,000人以上のNPCは、人工知能システム「Radiant A.I.」の採用により、周囲の状況に応じて自分の意志で行動する。
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