Impassable Barrier

Exploring these strange ruins, I've come upon a locked door, leading higher in the tower. Most ruins across Aeternum are wholly accessible with a bit of work, but I've no idea how to penetrate this barrier. A mechanism of some kind stands near the door, and I imagine it should allow entry... if only I knew how it worked! Perhaps a key of some form. One of these Guardians, whom I have taken to calling The Surgeon (on account of how this place feels and how expertly he cuts down anything in his path), has been seen with some kind of glowing orb. I wonder... D. Johansson