Tome of Backlash IV

Effect
Use into Skills Master to learn skill Backlash IV: increases the Counter-attack ratio of this hero's units by 150 points. Can be used for hero with level 70 or higher and speciality Defense.

Obtain
It can be found in:
 * Wheel of Fortune.
 * Purgatory Abyss Layer.
 * Purgatory Abyss Layer.