Ever since we first heard about the spell, I have been without a doubt drooling over Army of the Dead. This level 80 Death Knight spell allows you to summon an army to your beck and call. In specific, it's a 6 second channel spell that summons several weak undead to taunt and fight your enemies. In addition, you take less damage equal to your dodge plus parry chance. It costs one of each basic rune type, and has a
10 minute 20 minute cooldown (You see how swiftly things change in the Beta?).
You can see the spell in action above (video found on Deathknight.info). You may notice some problems. For example, some the ghouls stand around and do nothing. In addition, the damage reduction on channeling does not seem to be working. Still, it's pretty cool seeing all those ghouls decend on the enemy, even if they are lowbie scarlets.