From the back cover:
Strange Creatures Stalk the Realms Terror and intrigue govern the realms, from Invidias' cursed ruling family to the savage heart of Verbrek's dark forests, from the ruthless and doomed ruler of Valachan to the vicious lord of the shattered land of Sithicus. The danger and challenges that these realms present tempt the hardiest of souls and lure countless adventurers to their doom. Can True Heroes Survive? The fourth Gazetteer provides a deeper look at the lands of Invidia, Verbrek, Valachan and Sithicus and of the sinister creatures who rule them. Perfect for single adventures and ongoing campaigns, Ravenloft Gazetteer IV is useful for both players and Dungeon Masters. Ravenloft books are published under license with Wizards of the Coast and are 100% compatible with revised 3rd Edition rules and the d20 System.