Answer:
A home of wood in a wooded place, but built not by hand. High above the earthen ground, it holds its pale blue gems. What is it?
What is lengthened by being cut at both ends?
I cost no money to use, or conscious effort to take part of. And as far as you can see, there is nothing to me. But without me, you are dead.
What comes once in a minute, twice in a moment, but never in a thousand years?
It can pierce the best armor and make swords crumble with a rub, yet for all its power It can't harm a wooden club.
What is always coming but never arrives?