Paizo loves to give you free content for Pathfinder, especially their Adventure Paths. They've posted up a Player's Guide for the Abomination Vaults path so, if you're playing in it, you can get some special abilities to help you make it through. You can download it for free now.
From the article:
When the mysterious lighthouse called Gauntlight glows with baleful light, the people of Otari suspect that it’s an ominous prelude to sinister events. Heroes must explore the ruins around the lighthouse and delve into the dungeon levels below. Hideous monsters, deadly traps, and vengeful ghosts all await the heroes who dare to enter the sprawling megadungeon called the Abomination Vaults!