Unholy Frenzy is a death knight ability learned at level 66 for death knights with the unholy specialization. It can be cast on the death knight or the death knight's ghoul as well.
- Patch 5.0.4 (28 August 2012): Updated; changed from Induces a friendly unit into a killing frenzy for 30 sec. The target is Enraged, which increases their melee and ranged haste by 20%, but causes them to lose health equal to 2% of their maximum health every 3 sec.
- / Patch 4.0.1 (12-Oct-2010): Added.