WoWDB

Requires Priest (Shadow)

Requires level 50

Void Bolt causes the target to become vulnerable to the void, increasing their damage taken from you by 10% for 12 sec. This effect may only be active on one target at a time.

Casting Void Bolt on an enemy that is already vulnerable extends the duration of your Voidform by 2 sec, or 4 sec if Void Bolt critically strikes.