Shadowmasque: Shadowkings, Book 3 (Unabridged‪)‬

Emperor Magramon is dead and his only son, Ilgarion, will finally ascend to the Khatrimantine throne, guided by the Archmage Tangaroth and protected by the Iron Guard. But dark undercurrents are moving beneath the surface of life in Sejeend, the imperial capital, and the agents of an old and malign power are plotting and waiting. Only the Order of Watchers, a band of renegade mages, has any inkling of what is afoot and their investigations lead to grotesque and violent confrontations.