Mask of Spells — Jonathan Moeller

Mazael Cravenlock is the last of the Demonsouled, and defeated a great dark power to save the world. But with that dark power dead, a new one rushes to takes its place, led by the sinister Prophetess of Marazadra. And unless Mazael stops her, the Prophetess will use the Mask of Marazadra to summon her wicked goddess, plunging the world into darkness...