Answer:
What three letters change a boy into a man?
I move without wings between silken strings. I leave as you find my substance behind
My full powers come when my makers are dead. I await a heavy hat to put on my head. What am I?
I break down buildings, I crumble mountains but you can't see me. What am I?
Though it be cold, I wear no clothes. The frost and snow I never fear. I value neither shoes nor hose and yet I wander far and near. What am I?
The answer I give is yes, but what I mean is no. What was the question?