Yeah, Elly got it right.

Flame and air
Hold it there,
Well, it's above Mt. Pyre, and it's in the air.

The crystals awake,
The ground will shake.
Crystals in it, ground will shake part is just a filler.

Up in the sky
It does fly.
Obvious.

Acording to lore,
Your body passes through its floor.
When you hit the warp by the shadow crystal, one of your party members says, "Did it feel like your body just passed through the floor?"

Also woulda accepted Dream Dungeon, but, Elly, your go.