Cult of the Star
This cult started preaching the coming of the Old Gods when comet? appeared in the night sky. Cult accused Devas for enslaving of the humanity. According to cult leaders Old Gods will destroy shackles of Devas rule and will bring Golden Age to simple people.
Some cult members were able to understand devish, and some leaders were even able to speak broken devish.
When artifacts stopped working Cult was able to defeat most Devas with their loyal followers. After a fake trial Devas were punished by imprisoning them in bronze sarcophagi.