I spy with too many eyes, one of the causes of terrible blight

I can be a Royal, a King, or even an Emperor, Yet I rule no domain or lands. I am a swimmer who cannot take flight, Yet I march through a frozen white.

I’ll scratch at a door when I want to get through, then once you open it, I won’t know what to do.

I jump from stone or steel and live for but a moment, Yet I can be the beginning of a raging monster That consumes everything in it's path. Or maybe I'm just a little bit of inspiration. What am I?

I am the frozen lake, and the ghosting of a heart, The violent shadow squad that tears a life apart. The fading arctic clock, the floor where skaters glide, And the flashing diamond chains where hip-hop stars take pride. What am I?