The Twilight or Twilight-cursed are not a faction or group with a common goal or culture. They are beings that have been struck by the Twilight curse. The affliction changes their bodies and burns away their spirit, replacing it with a common desire for destruction. They have no real leaders, but they tend to gather around the most powerful of their kind. Sometimes, it seems there is a collective urge driving or drawing them to specific places, but no mind has been known to give them orders.
They are enemies of all life but do not take pleasure in what they do: instead, they seem stricken with deep despair. It is as if they are enduring terrible pain and only destruction provides any hope of relief.
The curse can be transmitted via touch or spell, or it can simply spread through the ground or air itself. Depending upon the exposure, it takes from minutes to days for the curse to take full effect.
The curse itself was woven by Brannoc, but its original source was the Harbinger, an entity created by the Lost Souls who are trapped in the Wailing Lands. They poured all their despair and their hate into this curse, all their fury after the millennia of entrapment.
The aim of the curse was to destroy the world of the living and to end creation so that every soul would get a new chance.