Answer:
What goes up when the rain comes down?
What is never used unless it's in a tight place?
Held firmly in the hands, like a sword it cuts deep. Bloodless strokes, all, then forward we leap.
It is worldwide, but once only a spider could weave one
Golden treasure I contain, Guarded by hundreds and thousands. Stored in a labyrinth where no man walks, Yet men come often to seize my gold. By smoke I am overcome and robbed, then left to build my treasure anew
I have two eyes in the front and a lot of eyes on my tail