User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-76.69.7.125-20111219184537/@comment-76.69.7.125-20111219193535

Another post says that it's at HR70 and it's in the Ceadeus cave. So, two things.

- After the HR system changes, monsters are unlocked as your HR increases. We don't know what the maximum HR is, so there could still be more monsters to unlock. - Lagiacrus Rare Species is fought in an elder dragon's area. Is the Tower an elder dragon area too?