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Thundrillium Mine of Hook Mountain is an old abandoned mine located on the snowy highland of Third Earth. The mine has large deposits of Thundrillium in it, but it also is the home of the evil spirit known as the Mad Bubbler. The Bubbler produces bubbles to trap any unsuspecting victim who enters the mine. Breathing the gas contained in the bubbles causes the person to develop Mine Madness, a condition in which the victim succumbs to the evil in their heart completely.