Answer:
A certain wizard resided in a city made from this gemstone.
Grows from the ground, bushes and grass, leaves of yellow, red and brow, unruly plants, get the axe, trim the hedge back down.
What can go through glass without breaking it?
I have one door and five rooms what am i
Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.