From the announcement:
Fantasy Flight Games is proud to announce Cities in Ruin, a new expansion for Eldritch Horror!
You feel it just below the surface. Something gnawing at the edge of sanity, a feeling that the steady march of machines and concrete that have come to be recognized as progress in the modern world is transient. Your visions show you a desolate future, where all that remains is dust, ash, and those who have long slumbered.
Violent earthquakes contort cities to unrecognizable ruin, unrelenting typhoons eradicate coastlines, and deep below the Earth something ancient stirs. Shudde M’ell, The Cataclysm from Below, approaches with destruction and ruin as his heralds.
Cities in Ruin sees four new investigators face the brink of madness to battle Ancient Ones, and introduces a slew of new monster and encounter cards to the world of Eldritch Horror. And what's more, new Ancient One Shudde M’ell’s presence brings a destructive twist to the game in the form of the Disaster deck.