Answer:
Whoever makes it, tells it not. Whoever takes it, knows it not. Whoever knows it, wants it not. What is it?
Vikings use this for warmth.
What has six faces and twenty-one eyes?
The stack just might be sent all over. Full of what's new, yet it's nearly obsolete.
Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
Both a currency and an antlered male. What is it?