Midnight's Mask (Forgotten Realms: The Erevis Cale Trilogy, Book 3)

The shadows deepen in every corner of the Realms.

The sun no longer shines on a man who has embraced the darkness within him.

The day's opposite finds Erevis Cale so far along the path away from his own humanity, he may never again walk as a man.

In the end, to be Chosen by a god like Mask is more curse than blessing...