Answer:
Iron roof, glass walls, burns and burns and never falls.
Plant whose name sounds like a dish full of dairy spread.
Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
What breaks on the water but never on the land?
Always wax, yet always wane: I melt, succumbed to the flame. Lighting darkness, with fate unblest, I soon devolve to shapeless mess.
Often cooked as fillet, this meat comes from an animal that swims underwater.