From publisher blurb:
An angel of destruction falls from the sky, threatening the very heart of the Empire of Confederated Nations. Our heroes must reach the heart of a city under attack from above and confront the angel - Asa the Seeker. Yet even with the Asa’s defeat, the world is in danger from his approaching master: the only hope is to delve into the Vault of the empires founders and recover the very thing they used to make it great: the Seed of Change, an artifact with the power to erase even a god.
In addition to the adventure, this book includes:
Details on the Empire of the Confederated Nations
Detailed statblocks and histories for three key NPCs
Entropy - new monsters you can use in any campaign
Recharging magic, and other superpower themed alternate rules to keep your players all day long