How do I get the Moon Sigil?

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u need to have obtained all the secret aeons (i.e, yojimbo, anima and the magus sisters) then defeat all belgemines aeons. after defeating her magus sisters send her to the farplane to get the sigil. if u don't send her u will have to defeat the magus sisters agen to send her.

if ur havin trouble getting all the secret aeons post here n we'll help u out.