empyreal [em-pir-ee-uhl, -pahy-ree-, em-puh-ree-uhl, -pahy-]

adjective:
1 pertaining to the highest heaven in the cosmology of the ancient
2 pertaining to the sky; celestial
3 formed of pure fire or light

Examples:

In the hypnotic and immersive world of the supernatural thriller Falling Stars, the existence of an empyreal coven of witches, who once a year individually zip down to Earth to collect herbs and goodies left out as tribute by mostly penitent humans on a holiday called First Harvest, is a given. (Shawn Macomber, A Witch Brings Down Vengeance in the Fascinating Falling Stars, Rue Morgue, October 2024)

She has conjured up the Pharaonic funk and empyreal jazz of George Clinton and Sun Ra. (Holland Cotter, Met's Beloved Roof Garden Draws on Ancient Egypt and South Central L A, The New Tork Times, April 2023)

The last of the olives would have been picked and the grape harvest over, the sap retreating in the vines, the withering leaves transforming the lush green undulating hills of Chianti to a picturesque mosaic of autumnal reds, ambers, golden yellows, fading to copper, bronze and ochre against an empyreal blue sky. (Curtis Marsh, Not too late for Tuscany, The Wandering Palate, December 2011)

Usurping the empyreal realm of the eagle, he assumes for a time the port and dignity of that majestic bird, and often is mistaken for him by ignorant crawlers upon the earth. (Washington Irving, Astoria or Anecdotes of an enterprise beyond the Rocky Mountains)

To the bright tireless eye of the vulture, an infinite speck hung motionless in the empyreal heights of cosmic space, was something else - the swaying, tottering, reeling figure of a man. (P C Wren, Beau Sabreur)

Origin:

late 15c, 'pertaining to the highest heaven,' from Medieval Latin empyreus, from Greek empyros 'fiery,' from assimilated form of en + pyr 'fire' (from PIE root paewr- 'fire') + -al. Confused by early writers with imperial. (Online Etymology Dictionary)

Empyreal can be traced back to the Greek word for 'fiery,' empyros, which was formed from the prefix em- ('in,' 'within,' or 'inside') and -pyros, from pyr, the Greek word for 'fire.' When empyreal entered the English language - via the Late Latin empyreus or empyrius - in the 15th century, it specifically referred to things related to the empyrean, the highest heaven or outermost heavenly sphere of ancient and medieval cosmology, which was often thought to contain or be composed of the element of fire. In the works of Christian writers - such as Dante's Divine Comedy and John Milton's 'Paradise Lost' - this outermost heavenly sphere was associated with the Christian paradise. Empyreal is now also used more broadly in the senses of 'celestial' and 'sublime.' (Merriam-Webster)