Sees the Library's barrier

She gestured around vaguely as we exited the airship, but I was pretty sure I knew what she meant. With the way my sight was blending together, I wasn’t sure if it was visible to the naked eye, but there were pathways along the ground, looking faded enough that I might have thought them several weeks or months old—if not for the size. Gigantic, just barely luminous lines spread across the ground like veins, completely circling the structure, and even the smallest was as wide as my shoulders.

The amount of power needed to leave something of this scale across an area this big…I dialed the timeframe up a bit.

“I can see it,” I confirmed at her look, nodding slightly. “There are lines all over the ground. The remnants of something old and big.”

I saw her relax a bit at that, nodding to herself.

“I’ve never seen it,” She said. “It was an archaic method even back then. But there were several…I suppose we could call them defense grids, built into major areas at the time. Used properly, they could erect a defense barrier capable of warding off even an army of Grimm.”