The World of Warcraft Death Knight Unholy spec is an AOE [Area of Effect] based talent tree.

Where as this talent tree is one of the more powerful PVE specs available.

• However the Unholy Death Knight has certain traits that also make it viable for general PVP use such Battle Grounds.

In PVP the World of Warcraft Death Knight Unholy spec has some very use full talents such as,

Ghoul Frenzy when applied grants your Ghoul 25% haste for 30 seconds and heals itself for 60% of its health over the duration.

Also the Improved Unholy Presence While this trait has very little use in PVE it is very essential in PVP you retain 8%up to 15% of movement speed from unholy presence and your runes finish there cool downs 5%up to 10% faster

The magical spells in the Unholy tree make the World of Warcraft Death Knight very powerful in PVE.

With talents like Desecration which covers the ground the the Death Knight stands on slowing the movement speed of targets and increases the damage done while standing on the Unholy ground.

The talent Outbreak in PVE is essential because it raises the damage don by the Scourge Strike and the Plague Strike which in the unholy spec is used very often.