Textbook (Whos Who of the Underworld)

A guidebook for Demon Busters penned by a leading authority in the field. Increases your progress in the Demonology expertise.

*Effect is boosted when under the effect of an Incense of Mastery.
*If expertise progress cannot be increased any further, item will disappear without doing anything.
*If expertise progress has been locked, item will disappear without doing anything.