Answer:
Marking mortal privation when firmly in place. An enduring summation inscribed in my face.
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
When you stop and look, you can always see me. If you try to touch, you cannot feel me. I cannot move, but as you near me, I will move away from you. What am I?
I can be cracked, made, told, and played. What am I?
I can point in every direction but can't reach the destination by myself. What am I?
What made Cyclops quit teaching?