Talk:Nether Infusion/@comment-24053170-20160624234957/@comment-24053170-20160625003649

According to this there uncertain exactly what it is-

"The Fifth True Theoretical Factor (第五真説要素, Dai Go Shinsetsu Yōso?), the natural enemy of the Fifth Imaginary Factor (Ether), the Conceptual Weapon Longinus (Black Barrel) was made out of this unnamed substance, Many people have come up with different names for this possible 5th element. Mages claim this element to be "quintessence" or "Nether", while modern scientists call it "Dark Matter". In Fate/EXTRA Rin Tohsaka called it Etherlite, but its relationship with Sion Eltnam Atlasia's Etherlite is unknown."

They don't know what to call it, some call it Nether, others call it Quintessence(which ironically was the original name for Aether), and still others call it Dark Matter.

To sum it up, we don't know what exactly it truly, is since as its name suggests it Theoretical...