I bring many things to life, with just one push. I also bind opposites together, and add flourish to the belly. What am I?

In the morning, my shadow is long, by noon, it’s short and strong. What am I?

Draped o'er thy visage, A veil of mystery lies, Shadows cloak the night.

In crowded halls, my echoes sing, I'm where empty stomachs find filling. My other meaning's quite unlike the first: Take a hike with me and quench your thirst.

My first is a historical capital city, with stories inside the Bible, though in this context, the words roots come from wootz. My second is formed by forging iron and carbon, it make up is in cutlery items. When you combine the two, you get a special type of material, folded, for strength and design.