Talk:Grigori/@comment-86.131.202.219-20120428224414/@comment-5139220-20120530022515

They don't.

Warning spoiler...

They are created by the Seneschal (aka god) to test the resolve of the Arisen and motivate them to achieve the willpower to ascend to the role of god himself, therefore freeing the previous Seneschal and resulting in the new Seneschal being required to test other humans to find the next person to ascend their role, endlessly repeating.