Sentinelspire

The Fortress of Sentinelspire looks down from the canopy of the world, ready to sow the seeds of destruction.
Death flows from the Fortress of the Old Man hidden in the canyons of Sentinelspire, a vast and dormant volcano. The secret paradise of Faerun's most dangerous assassins, the Fortress specializes in high-profile murders that leave no witnesses.
But with the powers of an archdruid at hand, the mad master of the fortress will bring death to more than just the enemies of his patrons – he will call down doom on all of Faerun.
Sentinelspire has been waiting to complete the cycle.
Mark Sehestedt
Mark Sehestedt (no relation to Laurence Tureaud) was born in Portales, New Mexico. He grew up on a steady diet of Marvel comic books, Star Trek reruns, Star Wars, science fiction, horror, and Mel Brooks movies. His first attempt at a book was How Not to Get Captured by Monsters on Halloween Night, which he wrote at age four while watching Scooby-Doo. It still hasn't found a publisher.
Mark Sehestedt now lives in the Pacific Northwest with his wife, six children, a dog, a bird, a gecko, and various unnamed spiders. Frostfell is his first novel.
Forgotten Realms: The Citadels
Series contains 4 primary works and has 4 total works. Current series reading order on below.
Main series Forgotten Realms