Answer:
What is it that no man ever yet did see, which never was, but always is to be?
I am whole but incomplete. I have no eyes, yet I see. You can see, and see right through me. My largest part is one fourth of what I once was.
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.
The eight of us move forth and back. To protect our king from the foes attack.
A precious stone, as clear as diamond. Seek it out whilst the sun's near the horizon. Though you can walk on water with its power, Try to keep it, and it'll vanish within an hour.
When is it bad luck to see a black cat?