Mistborn · World

Daytime Mists

Also known as Deepness, Daytime killing mists, Deepness mists

visual rule

Thick gray/white dense mists appearing and persisting into daytime (progressively earlier), flow in large river-like patterns, reddened by morning sun, evaporate in buildings, form shapes/spirits, cause seizures/thrashing/sickness/death in non-Allomancers, longer-lasting away from Luthadel, cause mass starvation fear

Category: visual rule
First appears: Book 2 · Ch. 13
Books: 2

Daytime Mists first manifest in The Well of Ascension as an unnatural phenomenon that defies the traditional nocturnal boundaries of the mists, appearing earlier each day and persisting into daylight hours. These mists evolve from a localized threat around Luthadel into a global catastrophe in The Hero of Ages, where they actively hunt and selectively kill humans through violent seizures while granting immunity to survivors. The phenomenon transforms from a passive environmental hazard into an aggressive, intelligent force that reshapes human civilization and survival patterns across the Final Empire.

Evolution

BOOK 2The Well of Ascension
Thick gray/white dense mists appearing and persisting into daytime (progressively earlier), flow in large river-like patterns, reddened by morning sun, evaporate in buildings, form shapes/spirits, cause seizures/thrashing/sickness/death in non-Allomancers, longer-lasting away from Luthadel, cause mass starvation fear
BOOK 3The Hero of Ages
Thick gray mists appearing earlier each day even in daylight, twisting tendrils sprout and expand, selectively kill humans via seizures (one exposure grants immunity)