Answer:
What has a single eye but cannot see?
I cut through evil like a double edged sword, and chaos flees at my approach. Balance I single-handedly upraise, through battles fought with heart and mind, instead of with my gaze.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?
A doctor might remove one from the neck of a Dracula victim.
Has no feet, but travels far. Is literate, but not a scholar. Has no mouth, yet clearly speaks.
You use it between your head and your toes, the more it works the thinner it grows.