What's the noun for empyrean? Here's the word you're looking for.
empyrean
The region of pure light and fire; the highest heaven, where the pure element of fire was supposed by the ancients to exist: the same as the ether, the ninth heaven according to ancient astronomy.
“The balloon went up, and we all saw it then, floating high, high, in the empyrean.”
“Someday, it may even be possible for the soul of a skeptical scientist to orbit into the empyrean, carrying his karma with him, looking for a suitable body to be born into!”
“Moreover, he presents the peak of his own activity as losing himself in an imaginary empyrean.”
