Quintessence

Aristotle believed that the celestial bodies were made of a fifth element, called the aether or quintessence.

It was once believed that the celestial bodies sat in quintessence, a fifth element not found on Earth.

Unicorns use quintessence for magical purposes.

As families and kindreds sometimes do; producing, after long ages of unnoted notability, some living quintescence of all the qualities they had, to flame forth as a man world-noted […]

The Pagans did well enough; I cordially admire the refinement of their minds; but it has been reserved for a Christian country to attain this extreme, this quintessence, this absolute of poignancy.

For vvhat is ſilke but eu'n a Quinteſſence, / Made vvithout hands beyond al humane ſenſe? / A quinteſſence? nay vvel it may be call'd, / A deathleſſe tincture, ſent vs from the skies, / VVhoſe colour ſtands, vvhose gloſſe is ne're appalld, […]

Let ther be Light, ſaid God, and forthwith Light, / Ethereal, firſt of things, quinteſſence pure, / Sprung from the Deep, […]