Forgotten Realms: Canticle (Cleric Quintet #1)

High in the Snowflake Mountains sits the Edificant Library, a place of scholarly study for priests, bards, and others. Now from the hidden vaults beneath the library a devastating curse is unleashed, and a young cleric must battle the terrifying creatures set loose by a malevolent, consuming essence that's been released, before his own brethren turn against him. Cadderly must put his studies to the test and enter the catacombs far below to save his brothers and himself.