Kore speculation

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If the axe was made by Kore, and Kore is a paladin, and Kore absorbs souls, and Kore keeps questing for the axe, and the axe is broken by bad deeds*, and Kore is a Paladin that makes bad deeds, then I suspect that Kore was meant to be the original wielder of the axe; he absorbs the souls of those he kills, so he is a more filling meal than just any other paladin, and his bad deeds would have been a decent measure of how many people he had killed.

Kore could stay a paladin because he's acting under an epic geas/quest spell (although I am quite ignorant when it comes to this stuff).

*the staff breaks magical bindings, but I have trouble believing that a demon would really trap itself hoping that someday someone with the right item will be so ill-advised to use it on the axe.