Spellbook needed to learn 'Arcane Power'.

Required:
Sorcerer - Lv. 70
Necromancer - Lv. 70
Spellsinger - Lv. 70
Spellhowler - Lv. 70
Overlord - Lv. 70
Terramancer - Lv. 70

To obtain this item, hunt the Conjurer Bat Lord found in Blazing Swamp.