Ok, since I can't find a riddle thread for these games, I'm gonna start one up. Also, because I killed the last one when I moved and couldn't get on net for a while and I had been last to post a riddle...

But, anyways, here goes.

Flame and air
Hold it there,
The crystals awake,
The ground will shake.
Up in the sky
It does fly.
Acording to lore,
Your body passes through its floor.

What is it?