Gain a stack of Exploitation for each enemy you inflict with Fear using Banshee's Wail or Insidious Whisper.

Exploitation:
- Decreases the Cooldown of Focal Concussion and Enervate -10% per stack.
- Lasts 40 sec.
- Stacks up to 5 times.
- Casting either spell consumes one stack.
- While under the effects of Exploitation, both spells will deal 90% of their damage as mana burn instead of normal damage, restoring an equal amount of mana to you.