Pathfinder RPG 2E: Adventure Path - Vaultlines

Trouble rumbles in the Darklands beneath the world's surface! Magic capable of astonishing transformations may just have fallen into sinister hands, with mysterious villains poised to transform an entire underground region at their whim. Your characters must trek through the monster-infested Darklands, from claustrophobic tunnels to jungle-filled hidden worlds, pursing an enemy connected to an ageless evil. Can you untangle sinister plots and ancient rivalries set into motion before human reckoning? The Vaultlines Adventure Path is a complete Pathfinder Second Edition campaign for 11th- to 20th-level characters, written by Sen H.H.S., Jacob W. Michaels, and Andrew White, with additional material by Matthew J. Hanson, Paul Hughes, and James Jacobs.