Answer:
Mountains will crumble and temples will fall. And no man can survive its endless call.
Scythe of darkness, Shadow’s light. Guiding eye of thirteenth sight.
I'm not man's best friend, I'm their enemy, I can mark your end, yet you do not see me, I am very small, but very tough, If you have me, then you have it rough.
I am seen in the water. If seen in the sky, I am in the rainbow, a jay's feather, and lapis lazuli.
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.
What language does a billboard speak?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?