Answer:
You seek it out, when your hunger is ripe. It sits on four legs, and smokes a pipe.
A horrid monster hides from the day, with many legs and many eyes. With silver chains it catches prey. And eats it all before it dies. Yet in every cottage does it stay. And every castle beneath the sky.
You can see nothing else, When you look in my face, I will look you in the eye, And I will never lie.
At first, I am nothing. Add something to negate. Add again to oppose. Add again to find the time to draw. Add once more to find nobody at all.
Walk on the living, they don't even mumble. Walk on the dead, they mutter and grumble.
What is always coming but never arrives?