Babylonia: Reed Fields (Free Quest) is the best AP-saving & time-saving location to farm Stinger of Certain Death. You'll get around 6x Dragon Fang by spending 210 AP.
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Murder at the Kogetsukan
Inheritance of Glory
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Arc 2: Cosmos in the Lostbelt
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Ereshkigal
Arthur Pendragon(Prototype)
Gorgon
Black Holy Grail (The Black Grail)