Answer:
I am a shimmering field that reaches far. Yet I have no tracks and am crossed without paths.
I am constantly overlooked by everyone but everyone has me.
Marking mortal privation when firmly in place. An enduring summation inscribed in my face.
In a tunnel of darkness lies a beast or iron. It can only attack when pulled back. What is it?
My first two letters say my name. My last letter asks a question. What I embrace I destroy.
What made Cyclops quit teaching?