The Crystal Core is a particularly nasty entity existing for some reason in the remote region of Seek Valley. It poses a dangerous obstacle to Tir's expedition to retrieve Moonlight Weed. Seek Valley is known to be a rich treasure trove of crystals, including some of which are known to be alive, however, this monster's placement seems questionable. Whether or not the Crystal Core was in Seek Valley by its own volition, or if it had been strategically placed there in foresight by Windy or Yuber to thwart the development of the antidote for the Dragons, remains a complete mystery.