Nox/Wizard/Chapter 2: Galava Castle

Just after entering Galava castle, go down to "The Griffon's Nest", there are four rooms, choose upper-left room with blinking light(without window), walk in to the left wall center inside that room, you'll notice it opens to the hidden corridor, go strait and hit and you uncovered a secret area with only one in all wizard adventure "Energy Bolt" spell.