Want to raise the stakes? The novel, Dance of the Damned, introduces a mythos card of the same name that begins in play, presenting a persistent challenge for investigators. Like a ticking time bomb, the Dance of the Damned is ever increasing in power, growing stronger every time an investigator spends a Clue token or resolves a Headline mythos card. If the team can meet its lofty requirements in time, they can forever seal an inter-dimensional gate... but if they dawdle too long, a grim curse will fall upon them.

Arkham Horror: Dance of the Damned (Mythos)