"Strange Aeons" is a campaign arc of the Pathfinder role-playing game. It consists of six adventure modules: "The Whisper Out of Time," "The Shadow Over Innsmouth," "Dreams of the Yellow King," "The Sins of the Father," "The Thrushmoor Terror," and "The Apocalypse Prophet."

In the campaign, the players must confront an ancient alien entity known as the Great Old One Azathoth, who threatens to destroy the world. The players must journey to various locations, including the city of Arkham, the Dreamlands, and the city of Thrushmoor, where they will encounter a variety of allies and enemies, including cultists worshipping Azathoth, other Great Old Ones, and creatures from the Dreamlands.

Throughout the campaign, the players will face challenges such as battles against powerful foes, puzzles to solve, and moral dilemmas to confront. They will also uncover ancient secrets and learn about the true nature of reality as they work to stop Azathoth and prevent the end of the world. The campaign includes a variety of challenges and plot twists that will test the players' skills and resolve as they work to save the world from destruction.