Answer:
The sharp slim blade, that cuts the wind. What is it?
What measures out time. Until in time all is smashed to it?
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.
I am what remains when nothing is left.What am I?
It's like food but water kills it. What is it?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.