Answer:
Vikings use this for warmth.
It is the assumed nocturnal symbol of Mr. Wayne. What is it?
The sun bakes them, the hand breaks them, the foot treads on them, and the mouth tastes them.
Weight in my belly, Trees on my back, I travel fast in my place, but feet is a feature I lack
Always wax, yet always wane: I melt, succumbed to the flame. Lighting darkness, with fate unblest, I soon devolve to shapeless mess.
I touch the Earth, I touch the sky, but if I touch you, you’ll likely die. What am I?