The Sinister Realm — T.J. Smith

Following the mysterious disappearance of a local townsman, Sam White waits for the cover of night to take his leap through the cursed oak's portal in search of the missing man. Within hours of his departure, Dan Clay and his friends are unexpectedly exiled to a land of atrocities. To escape the uncharted world, the seven intrepid adventurers must conquer the oppressive allurements of their surroundings and the unrivaled powers of their assigned guardians. In addition to confronting their worst suspicions, the travelers soon realize that they're in a race against time, a race against cold-blooded predators and, ultimately, a race to save humanity from the sinister realm. Embark on another quest with the explorers to a world where the boundaries of the imagination are shattered and from which no humans have ever returned to reveal their diabolical discoveries--until now.