This isn't an exploit, and not really a guide guide. Just a tip.
Lichborne is a frost talent that reads:
The important part there, is that you're UNDEAD ... not humanoid."Draws upon unholy energy to become undead for 15 sec. While undead, yadda yadda yadda."
EDIT: While dueling my DK, I was able to shackle him while he was under the effect of Lichborne. So I suppose this can somehow come in handy in PvP like the one chance in a blue moon.
The next spell is: Death Coil:
.yadda yadda or healing ### dmg from a friendly Undead target
Now, the tip is, you can use Death Coil on yourself while under the effect LIchborne to heal yourself a little. It's not a big heal but it helps. I have lived several times by doing it. If you are full of runic power, you can heal a couple times.
It just kind of dawned me on while leveling today and thus tried it.
EDIT: I also havent been able to try to see if another DK in my party can heal me while I have lichborne on either