Tatarigami were extremely powerful and malevolent entities in Japanese folklore considered to bring massive conflicts and calamities such as famine, plague, war, death, fire, and any other imaginable evil upon the lands.
They could be born of fallen gods or even the spirits of particularly vengeful individuals. Whenever a Tatarigami arose it was seen as a living disaster and only through appeasement could these monstrous spirits be prevented from tearing the world around them apart, as such many shrines and festivals arose to appease the Tatarigami and a number of these traditions lived on for a long time as part of traditional religious life.
Tatarigami, regardless of origin, are universally hateful demons that despise the world and exist to inflict massive vengeance upon any and all in their path. They were said to often have an especially strong hatred of nobility but due to the large-scale destruction they would rain down upon the world they likely hated all life and were, in essence, a living embodiment of pure hatred.
Despite this they could be appeased by having shrines built in their honor or having festivals. This was seen as the only sure way to stop Tatarigami.