Answer:
A certain wizard resided in a city made from this gemstone.
They have not flesh, nor feathers, nor scales, nor bone. Yet they have fingers and thumbs of their own.
Add a T and I shoot through the sky. Then add an S and I multiply. What word is it?
They can be harbored, but few hold water. You can nurse them, but only by holding them against someone else. You can carry them, but not with your arms. You can bury them, but not in the earth.
The root tops the trunk on this backward thing, that grows in the winter and dies in the spring.
What is so fragile that saying its name breaks it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?