The nature of the game being what it is, that means it is almost certainly home to that ancient oni, and said oni is looking forward to fighting you.
For those interested in advancing the cause of science through dungeoneering, you’ll be happy to know that the hard more of Fractal Continuum is all about exploring these Allagan ruins for the benefits of the Garlond Ironworks. Of course, there are still new ancient weapons stirring deep within the facility that will no doubt require some rather vigorous deactivation, but you were going into a dungeon. You knew what you were getting into.
Source: Official Site