Answer:
Always wax, yet always wane: I melt, succumbed to the flame. Lighting darkness, with fate unblest, I soon devolve to shapeless mess.
Soldiers line up spaced with pride. Two long rows lined side by side. One sole unit can decide, if the rows will unite or divide.
I can run but not walk. Wherever I go, thought follows close behind.
What is that you will break everytime you name it?
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.
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.