The fourth boss, Deathbringer Saurfang, was a bit of a pain

The main mechanic of the fight are his bloodpoints. He has a bar that gets filled up as certain things happen. If someone is hit by his blood nova, which is a range attack that explodes in a 12 yard range then he gains 2 blood points. He summons 2 blood beasts, or 5 in 25 man. Remember the shambling blob things after the chess event in Karazhan? When these hit someone he gains 3 blood points, so they get kited and killed when they spawn. Saurfang places boiling blood on people, he gains 1 blood point per tick of that. He puts a rune of blood on a tank, this is a debuff that falls off after 20 seconds, the other tank needs to taunt him when his partner gets the debuff or Saurfang gains 1 blood point per time he hits the tank while he has the debuff.

Hopefully now you understand where he gets his bloodpoints from, now the fun part. Each time he reaches 100 bloodpoints he puts a "Mark of the Fallen Champion" on a random raid member. This mark does about 3k damage to it's target every time a tank is hit, it is non-dispellable, persists through death and for each tick it give 1 blood point to Saurfang. Any time someone dies with the "Mark of the Fallen Champion" Saurfang regenerates 5% of his health. This make battle rezzing anyone questionable because chances are that person will die again shortly and give Saurfang another 5% health. What the marks do is essentially create a soft enrage, the speed at which Saurfang gains blood points increases each time he reaches 100 blood points because of the Mark.

During our early attempts we had problems with me pulling the beasts back to me due to AE threat, we had people battle rezzed and re-dying to the Marks of the Champion, we had some people die to the beasts when they were kiting. In the end we ended up having our third healer go in boomkin form and DPS especially at the beginning, I also worked hard to not generate any AE threat to keep from pulling the beasts to me when they spawned. He died to much whooping and hollering and dropped two tank pieces. I allowed the main tank to choose first as he had put the guild together and I had won the 10man tank trinket in TOC10 last week.