User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-4421067-20140505132926/@comment-4009941-20140505231012

Plesioths wing fin hold a Venom that causes sleep only and he used it by gliding and hitting you on a fly by. While Frontiers HC Plesioth is able to spray/splash the sleep venom out of his fins.