So my friend and I have been having a chat about the origin of the NIN powers and we are not sure where exactly the ten "heaven" power comes from?

Can anyone help us out here, is the ten "magic" actually from heaven, and in this game what is heaven? Is it the realm of the gods? My mate reckons it's drawn from the lifestream which would be cool.

Or is it more like a trancendence thing? Channeling inner power to reach a state of focus akin to inner peace and all that?

Or is it simply the sky? And heaven is literally just up/ the air?

Any answers would be greatly appreciated.