Answer:
With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?
By Moon or by Sun I shall be found. Yet I am undone if there's no light around.
I am lighter than air, but a hundred people cannot lift me. Careful, I am fragile. What am I?
When I live I cry if you don't kill me I'll die.
Oh lord! I am not worthy! I bend my limbs to the ground. I cry yet without a sound. Let me drink of waters deep. And in silence I will weep.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.