Undead Priest Spells

Devouring Plague: Devouring Plague puts a disease debuff on the target and does damage over time equivalent to a Shadow Word: Pain of the same level. That in itself is very useful. The plague also heals you for every point of damage it deals.

Touch of Weakness: Undead Priests also get an ability similar to the Troll's Hex of Weakness called Touch of Weakness. Touch of Weakness is an instant cast self buff that deals damage and reduces damage dealt by characters that inflict melee damage on you. This spell is mainly a PvP or soloing spell because the debuff slot is being put to waste by a minimal reduction and the Priest has to get hit to apply it. While you could gain enough threat with an NPC to get him to hit you then Fade, I recommend you never do it. In Blackwing Lair if a boss has aggression on you long enough to hit you, he will most likely wipe the raid. In other instances, if you have slightly more threat on an NPC than the tank you will be forced to stop healing for a period of time to let him surpass you in threat unless you want to die.