Answer:
You need a key to receive an answer from me. The answer you'll find is straight from your mind. What is it?
Put into a pit, locked beneath a grate, guarded through the night, yet it still goes out.
I am what remains when nothing is left.What am I?
I scribble forms of the finest letter, And repel elements of the harshest weather. I am an arrow-aimer and a dust-breaker.
Whoever makes it, tells it not. Whoever takes it, knows it not. And whoever knows it wants it not
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?