Answer:
I dig out tiny caves and store gold and silver in them. I also build bridges of silver and make crowns of gold. Sooner or later everybody needs my help yet many people are afraid to let me help them.
They are many and one, they wave and they drum, used to cover a stare, they go with you everywhere.
I carry you down a gentle stream.
I am the only word that looks the same when spelled upside down.
I have no life but I can die. What am I?
Often cooked as fillet, this meat comes from an animal that swims underwater.