*The 'Neverside Wars' are a series of tragic events that occurred during the Wizard Period. An individual known as Edric Blackhawk led a multitude of Neverside armies, which included Wraith Lords. At an unknown point during the conflicts, he became the High Lord of the Wraith, known as Warlock and seeked to attain control over the Neverside and the Dayside, along with its inhabitants. On the Last Night of the Neverside Wars, a great battle raged on, and it saw the Wraith army being crushed by Wizards and other allied entities.
Apparently, just like the Nekross they were cruel, venomous creatures from the Neverside that tortured Wizards.
This was the cause for Wizards to start hiding in the 'Shadows'.