Answer:
Scythe of darkness, Shadow’s light. Guiding eye of thirteenth sight.
I'm light as a feather, yet the strongest man can't hold me for more than 5 minutes.
People like this usually live in rural areas, unless they are lucky enough to strike oil and move to Beverly Hills.
To unravel me you need a simple key, no key that was made by locksmith's hand. But a key that only I will understand.
Man walks over, and man swims under. In times of war, it can be burned asunder. What is it?
What never gets any wetter no matter how hard it rains?