There's a ring of blood style line in Zul Drak (Ampitheatre of Anguish). The whole Wrathgate questline was pretty epic (spent nearly all day Friday doing that one on my Alliance team). If you go to Wowwiki and search for "Wrathgate" there's a handy guide on all the prerequisites you have to do to start it.

The only thing that really sucks about WolK is the way they did quests. If you skip one, you could potentially lock your self out of 50 more quests, so keep that in mind.