Answer:
I come in winter. I cannot see, hear, or feel. I can't eat, but you can eat parts of me.
Which is faster, hot or cold?
I weaken all men for hours each day. I show you strange visions while you are away. I take you by night, by day take you back. None suffer to have me, but do from my lack.
Which friend of a witch eats the fastest?
A white field, and when it is plowed, its soil is black.
What an fill a room but takes up no space?