Answer:
A certain wizard resided in a city made from this gemstone.
What is round as a dishpan, deep as a tub, and still the oceans couldn't fill it up?
It cannot be seen, it weighs nothing, but when put into a barrel, it makes it lighter.
Not a burden for its weight and daily carried out, He who takes it wishes it had never come about
What has a single eye but cannot see?
Why was the cook arrested?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?