If you have those half elixirs start burning them. Luminious fangs is bullshit. It took me over five hours of farming on expert map just to finally have one drop to limitbreak my Artemis the third time on my first week of playing kamihime-r. I think i blew through my whole starting wad of half elixirs just to get my artemis ready to see her second hentai scene. Granted that was before I knew her hentai scene sucked balls, had I known i wouldn't have bothered.