In terms of magical energy, omnifex, or Soul Stray as the Runesworn call it, is the most potent power source, because it is said to be the "soul of Grellis". It is a spiritual energy that permeates everything, the purest essence of Grellis, and is a combination of drenifex (Bone Stray), orifex (Breath Stray), helifex (Blood Stray), and gernafex (Skin Stray), the four minor essences of Grellis. Of all the races, the Eldinar alone contain Soul Stray, while the other races save the Meninar contain only one of the other lesser essences, as they were made by the celestial gods. The Meninar, being half-breeds, also contain Soul Stray, but to a lesser degree than the Eldinar.
Fall of the Eldinar
The non-elf races (humans, dwarfs, giants, helimer, attawa, and jrel) possessed only the lesser essences, being that they were not created by Grellis. The Eldinar possessed pure Soul Stray, which always made the gods jealous, as they were made with half Soul Stray, and half of the lesser essences. It came to pass that the gods Drend, Orend, and Helirend sought to banish the angel M'ranin and the Fouled Seven to the Shadow Lay, but to do so they needed Soul Stray to trap them there. Rather than take any Soul Stray from celestials, which would weaken them, they conspired to steal it from the Eldinar. Since they did not have the power to steal it, they used the angel of deception, Fethylden, who tricked the Eldinar into giving up some of their omnifex, which made them lose their immortality. In doing so, they became the Inar, or elves.