Frayed
Beings
See also: Fraying
Frayed are a type of spirit that draws sustenance and power from Fraying the Weave. They come from the Far Realm.
Nature
Many beings and spells can reshape the Weave, allowing raw magic to flow around something. In contrast, a Frayed spirit rips the strands apart.
A Frayed spirit can possess a humanoid and enhance their abilities.
Fraying
If the Fraying is limited and short-term, the Weave can eventually heal on its own. Repeatedly Fraying the same area can impede this process. On the Prime Material Plane, a deeply Frayed area will typically become an apocalyptic wasteland. The Mournland on Eberron is one such wasteland, although it's not clear that Cyre was engaged in Fraying.
Frayed Lore is Forbidden
Fraying the Weave is widely viewed as reckless and wasteful. Even among the most selfish and ruthless gods, devils, and demons (and their followers), Fraying is generally regarded as anathema. Metaphorically, on the Edge Fraying worse than using nuclear weapons. Thus, any widespread or long-term use of Fraying will inevitably attract the attention of powerful beings.
Frayed are some of the most dangerous spirits to summon, because they literally eat the Weave. Hence, if a Frayed spirit gets loose, it can quickly impede a caster's ability to defend themselves or banish it. Almost all factions view using the Frayed as reckless and wasteful. Almost all factions don't even keep meaningful information about the Frayed, beyond how to detect them, track them, and banish them back to the Far Realm. The faction most known to condone summoning Frayed is the Brotherhood of the Shroud. Some Xaositects have also been accused of summoning Frayed. -Fonn
Summoning Frayed
Most spirits need help crossing from the Swift to the Grid. There are countless ways to ease their passage, including spells, rituals, sacrifices, etc. Frayed spirits need even more help, because they're coming from the Far Realm. It's clear that the Frayed need a special physical link on the Grid. In the Bunker, after the data virus converted the paramatter altar into paramatter leapers, the leapers needed to physically assault the R3M troopers in order for the Frayed spirits to possess them. Inscribed shotgun ammo is apparently another way to ease a spirit's passage. It's likely that the pain and damage that a shotgun blast causes is part of the magic that eases a spirit's passage and/or boosts their power during the critical first moment of possession. - Ulthane Stonebeard