Answer:
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it can neither see nor feel it. What is it?
A certain wizard resided in a city made from this gemstone.
Die without me, never thank me. Walk right through me, never feel me. Always watching, never speaking. Always lurking, never seen.
A man shot two arrows at its center and missed both times, but using a sword swung once at its center and hit it twice.
White bird, featherless, flying out of paradise. Flying over sea and land. Dying in my hand.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?