feels ley lines

There's a reason a fortress has been there for as long as mankind can remember-it is one of the world's largest convergences of ley lines. Ley lines are the natural currents of magical energy running through the world. They are the most powerful means of employing magic known to man-and the lines that intersect in the earth deep below the Auld Rock represent a staggering amount of raw power waiting to be tapped by someone skilled or foolish enough.
I walked over a ley line about three steps after I entered the Hidden Halls, and I could feel its shuddering energy beneath my feet, rushing by like an enormous, silent subterranean river. I walked a bit faster for a few paces, irrationally nervous about being swept off of my feet by it, until I could only sense it as a dim and receding vibration in the ground.


Turn Coat Chapter 14, Page 120-121