Tales from the Viscount: Volume II. Tales of Ardor, #5

The warrior elf Warren Dietrich has finally arrived in the pit of darkness known as the Sphere of Teneb. The expedition team must obtain rare artifacts and ancient knowledge to earn their place in the annals of elven history. It won't be easy, however. Bitter conditions and ravenous monsters make the Sphere of Teneb a place few adventurers dare to explore. If all that wasn't enough, a mysterious temptress lurks in the shadows.
These dark forces watch Warren and his compatriots with great interest. All the while, no matter how many enemies he strikes down, a mysterious, seductive force calls to Warren from deep within the bowels of this dark abyss. He can't prove it, but he can feel it in his bones: the machinations of a traitor within his ranks threatens to seal everyone's fates. Welcome to a world of dark fantasies and sinful desires.