What Lies Beyond
This is a portion of the Veil that does not lie over Virosia. Instead of attaching itself to what lies in it, the Veil here became its own entity; a landscape of pure magic in some form or another. Where folds occurred in the Veil along the Selvedge, new planes of existence expanded simultaneously, infinitely, and in a closed circuit.
As a closed circuit, these planes merged over and under one another, coexisting within the same infinite and eternal volume. There exists ways, like rivers from one to the other, but only one of these rivers had ever flowed not from one layer of the Selvedge to the other, but between the Veil proper to the other side. This was the River Silaea, which stemmed in equal, directly opposed flow to the River Bassyr. These Silaegian and Bassyric forces allowed the broadest destructive energies to meet where the Veil was bound to Virosia.
As the Silaegian beings glowed their brilliant radiance onto the Virosian continent, their ambrosian blood would be spilled by Bassyric demons of the Ink Eternal. Whatever world that existed before was destroyed in its entirety. After their war, the rivers both ran dry, though some speculate they were dammed. In any case, their stop left a homogenous world of an equal mixture of angelic and demonic blood named Lisaena by the elves. This pure mixture could be used by the spirits, to create a world with more peaceful life that is between the extremes of existence. The spirits, however, did not use all of the Lisaena, and this was known by a lone Bassyran.
Outside Divinity
The Selvedge and it's two "layers" are powerful places to access magic from, but requires great magical strength in order to do so. Put planely, when a mage creates a spell, they draw from the Veil immediately around them. Often for more powerful magic, a mage would need to gather more of the Veil around them, so that their mana may channel through it in ample portion. If a mage so chooses, however, they may choose from tufts of the Veil distant, perhaps with a fabric grain against what is local, more powerful spells can be manufactured.
The Selvedge is most far and abraisive against the Virosian Veil. So strongly, in fact, that magic of the Selvedge tends to have polarizing interactions with the Virosian reality in extreme ways; ways of pure creation and pure annihilation, of times both past and future. These effects take two to create, however, and a mage of the Selvedge always has an extraplanar companion, or in some ways, a patron that gives a spell's power passage to the caster's reality.