I think I know what's the last quest - actually, it just lengthens an existing quest. On Debir when you get the contract for Demenion's spy, now you cannot battle him just by talking to him - he refuses your claims and you need to find proof. Go back to the fisherman for whom you did the Devilfish quest, and he will let you know he found the missing tax papers, as well as seen a suspicious fellow try to dump them in the sea. Confront the spy with this evidence, and he will attack you now.
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