User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-91.231.90.90-20130412134948/@comment-112.209.26.72-20130413102228

Are you talking about the LS Hairblade with the 400 Water element?

Materials needed are Blue Cuthroat (probably got it from the fishing fleet), Bathycite Ore (HR), Whetfish, and Quality Sponge. Anything you're missing here?