Text:
Remove all non-Demon resonator cards in all graveyards from the game. Each player puts as many non-magic stone, non-chant darkness cards with different printed names as they can from their graveyard into the field, and loses X00 life, where X is the number of cards moved from their graveyard to the field this way.
Flavour:
"Every so often, the demons gather. It's an unholy feast of blood, death and depravity. I suggest staying indoors when it happens. But if you're not, it's at your own risk, of course." -King Valgott