.Something Undiscovered.

The chains clanked amongst one another, giving out a final "clink" when tightened still. Some were left loose, solely because the manacles would snap at its inhuman strength.
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Time after saving Gravity Falls from peril, an unknown monster seeks vengeance, quick to wrap its jaws around one of the unsuspecting Pine twins.

Cover found online.
Started 2/2/19 - Finished 5/31/20