You need to know when you can stop DPSing a mob and trust that your Soul Reaper/diseases will kill it so you can move on to a new melee target.

Save the Berserking buffs that spawn for Waves 8 and 9. You shouldn't even need to use them before then, so don't. You need to have Raise Dead, Empower Rune Weapon, Dancing Rune Weapon, and Army of the Dead all available at the start of Wave 8. The last 3, with the Shas where you need to do burst single target damage with their shields down, are the hardest. You won't take damage so don't use any Dodge, Parry, or Mastery at all. Reverberating Primal Diamond, Fallen Crusader, DPS enchants, all crit/haste gear. Gear like you would for max DPS in a challenge mode.

Glyphs: Death Grip, Pestilence (Blood Boil after patch), Swift Death The other two don't matter because you won't take damage. Talents: Roiling Blood (use PL after the patch), Chilblains, Blood Tap or Runic Corruption, Remorseless Winter. It's a little challenging in the last 2 waves, you will probably fail if you screw up just a couple GCDs. Comment by CryopathyDid the Gold Damage challenge as a Blood DK this week.

Wow they're doing it wrong