The Niflheim Empire's research into daemons paved the way for their weaponization via finding a way to control mutated organisms. Daemons are thus also repelled by the bright lights of inhabited areas, and even the strongest headlights of cars, as well as havens, which the populace believes to be the blessing of the Oracle. If they are out when the sun rises, black mist ( miasma) begins to emit from their bodies as they take damage from sunlight.
Daemons lurk in old ruins and caves, and emerge out in the open at night.
They vary in size and form widely, from the small and nimble goblins to the gargantuan Cerberi. Daemons are beings that thrive in the dark, and are damaged by light.