Below me swirled an ominous looking mist, and I knew that if I fell, it would mean my peril. - Raziel, Defiance
Mist is a hazardous element found only in Legacy of Kain: Defiance. It is initially encountered by Raziel in the ascending chamber within the Underworld, where Raziel must race to the top of the chamber before the mist reaches him. The mist is also found later in the game in Vorador´s Mansion in the Grand Hall on Raziel´s second visit.
The origin or the consistency of the mist is unknown but Raziel realizes it is deadly even to his existence. It is unclear whether the Elder God controls the mist or it is a natural occurent within the Spectral Realm.