User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-8874090-20140918132224/@comment-184612-20140918193408

Part of me things there won't be some "storm monster". If you look at the screenshot of Teostra in the Town, the sky is dark and stormy. It would also explain why there were sparks in the air during that trailer since Teostra uses explosive powder.