Masters support

This may not be a popular build at first sight, however what it does is it fully supports the death knight's abilities, attack power, and crit chances.

The Masters Support build is designed so you can be a competent second tank, but still have fun in the world, and pvp, it does this mostly, I find, through the blood, because in blood you have everything that can keep yourself, or the main tank alive using imp rune tap or mark of blood.
You also can get close to 12 additional attack power per armor slot, which greatly improves your over all power as well as the unholy spell gargoyle, and supports all your spells dmg in Impurity

Now, the Ice tree talents are there for lichborne, icy talons, and the 20 more runic power, some of you may want to place those talents to better suit your own playing style, but I enjoy just that little extra juice.

The Unholy tree in this build was most likely the hardest I had creating for the build, because I knew I wanted a permanent ghoul summon, as well as the gargoyle and imp death grip. Getting to those was some what more different, however what I talents I wanted to get to those was a little more tricky, and once again feel free to change some of this spec based on your playing style.

I decided to go with Necrosis and Corpse explosion, instead of out break, mainly because I tend not to use blood boil as a spell. I didn't want to take Durge because I wasn't going to be using scourge strike or obliterate, simply because for the same amount of rune I could cast deathstrike, and live longer.
I am, however, happy with the rest of the unholy build, as it supports either my straight forward abilities, or other aspects of the talent tree well providing me with two nasty surprises.

With the Masters Support tree don't expect to be the champion, expect to be the champions life saver.