Disaster / Destruction
Also called the Grand Conjunction by some, the Return was the sudden emergence of those living in the Mists.
Through a series of events known collectively by the Mist Denizens as the Grand Conjunction, the entire population of the Demiplane of Dread was shunted back to the place their ancestors were pulled from with little concern for who and what was already there. In total, roughly one third of the Mist Denizens survived the transition and are generally treated as refugees. The exact situation of that surviving third varies greatly from place to place. In all cases, however, large amounts of arcane energy left over from the destruction of such a large construct such as a domain, as well as the mass death and panic that occurred directly afterwards, created the much studied and sought after Vestige phenomenons.