From the description I'm seeing, it's most likely that this Arachne is the strongest Avatar of Plague that Callidora's information talks about. I was startled when I saw it. Its body was strange and didn't even look like a living creature. Its body looked more like a doll with all these separate parts, just Lithuanian in its current form.
I was scared at first, there was no denying that just seeing this creature made me feel scared, but I quickly realized that the creature hadn't seen me, which would be impossible since I'm in its line of sight. That's when I realized it was unconscious.
Looking closely, it wasn't moving. It was being dragged, and when I focused my attention, I realized that there was a flow of Aura carrying this creature in a specific direction. It was the same Aura that weighed on me, the Aura of this great entity.