Death knights are not always the first class you think of when you think group utility. They don't have a long-term crowd control method, they can't summon food or Healthstones, and they don't have one of those long term castable stat buffs like Mark of the Wild or Power Word: Fortitude.
That said, you shouldn't sell them short. We have a lot of little things we contribute to a group in a ways people may not think of. This week, we're going to look at some of the buffs, debuffs, and group utility moves death knights contribute, with an emphasis on things that or new or significantly changed in Mists of Pandaria.
Bringing the Buffs
Horn of Winter has long been a valuable buff that you should never neglect, and it's changed in some interesting ways in Mists. Instead of a flat buff to strength and agility, it now adds 10% attack power to you and your group. This ends up being pretty handy since it should scale as gear levels increase.