Gorged on Ruins (4E)

From publisher blurb: Welcome to the eleventh adventure in the ZEITGEIST adventure path! The World is Falling Apart After the stars fell and the sun vanished, a new world order arose, controlled by a group known as the Obscurati. Now four nations are poised to assault the party's homeland, Risur. The only hope to avoid defeat is to convince the invaders that they have been tricked, for it was the Ob who truly cast the world into darkness. It will take a great show of heroism to make them listen. But in a mix of fortunes, the departure of those vast armies have left the invading nations vulnerable to a series of great disasters back home - doomsdays the party might be able to avert. A wintry apocalyptic cult slaughters and brings anarchy. Cities go mad with eerie paranoia. An entire religion puts itself on trial for the sins of its god. This is how the world ends: not with a whimper, but with multiple bangs and a giant lava dragon birthed from an erupting volcano. An adventure for calamitous heroes of 25th level.