Answer:
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.
It can pierce the best armor and make swords crumble with a rub, yet for all its power It can't harm a wooden club.
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.
Two in a whole and four in a pair. And six in a trio you see. And eight's a quartet but what you must get. Is the name that fits just one of me?
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find.
The warmer I am the fresher I am.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?