Alright guys, I've got this. No worries.
Edit2: Just read I needed to put which guild I was "representing" and my class xD.
Guild: Nine Princes
Class: Priest
3 tanks, 5 healers, 17 DPS (added in the edit).
The first 30 seconds:
The DPS do a total of 2040000 damage. (That's 17*4000*30).
The tanks then do 180000 damage. (3*2000*30).
This then leaves the boss at 2780000 health. (5000000 - 2220000 = 2780000). This means that a new spawn comes up with 3614000 health. (2780000 * 1.3).
All the DPS minus the tank swaps to the new add. They bring it down to 1454000 health. (3614000 - [17*4000*30 + 2*2000*30]). This means the SECOND add will spawn with 1890200 health. (Now we're at the minute mark - that leaves 1:45 left).
The second add will be DPS'd down to ~5% health. So it will have 94510 health. This takes, with 17 DPS and 1 tank - 1795690 damage. This takes (rounding up) 26 seconds. The tank then stops DPS on this boss. Assuming a raid setup - they would stand around for the last four seconds waiting for the next add.
Now the healers are going crazy. Because they have the third add up in the aura - not easy to deal with. But I presume it's doable split between two tanks. The new add will spawn with health based on the second add. Which means it'll have 94510*1.3 = 122863 health. This is stupid easy to deal with and is killed by the DPS and tank in 1.8 seconds - let's go with 2 seconds.
Now we have two adds left back up. There's the add with 94510 health where the tank has stopped DPSing and the one we left alone who has 18902000 health left. We have spent 1 minute and 32 seconds in the fight so far.
All DPS quickly swaps to the first add that still has 1890200 health. They have 28 seconds left on it. The 2000 DPS tank has been going crazy for the past minute. So it's done another 120000 damage to it - leaving it at 1770200 health. Meaning then that the DPS [Note: The formula I'm using here is (17)(4000)x - 2000x = HEALTH] will take 25 seconds to kill it. We're now at 1 minute and 57 seconds. At this point I recommend the DPS stand around for the next 3 seconds, and we DPS down the newest add at the 2 minute mark - again taking health based off of the 94510 health add we left up at 5%. This means it takes another 2 seconds to down. 2 minutes and 2 seconds have gone by.
NOW the DPS go back to patchwerk's sister. They have another 28 seconds left to DPS it down. Again, since we left it, the tank has had another minute and 30 seconds to go crazy, 90 seconds, means (2000)(90) = 180000 damage, which leaves the boss at 2600000 health when the DPS get to it. The 17 DPS then have 28 seconds to do damage [(17)(4000)(28) + 2000(28)] = 1960000 health done. Leaving the main boss left at 640000 health. AMG close. It's now been 2 minutes and 30 seconds we're cutting it close. The DPS turns around, kills the new add in, once more, 2 seconds.
Back to the boss, we have 13 seconds left. Oh god. DPS goes nuts and they can get through the 640000 health in 9.1 seconds. Let's again, presume the worst and go with 10 seconds. That means there are 3 seconds left. Oh shitshitshit. DPS turns around and hits the 94510 health boss as hard as possible dealing that amount of damage in.... 1.35 seconds. Assuming 2, we have 1 second left on the enrage timer.
We loot, and then we all go take a shower because we're ALL covered in sweat and panting heavily.
Seeing as how I got called out for positioning, I'll put in where everything should be at each phase =P. (Before, I just assumed it would be obvious to pull everything as far away as possible - but I can explain it more in depth as to what I was thinking in my head before this happened). Also as to why it was down to the very last second - I was assuming raid-like behavior where we are unable to stop at exactly 1000 health, and just assumed at 5% and we stand around for 4 seconds and 7 seconds at one point to account for movement in melee =P.
The pull:
Tank gets either a misdirect or generates an infinite amount of aggro and pulls the boss to this corner here....
All the DPS spread out around right behind her. DPSing their hearts out as I described earlier. When the second add spawns, the second tank then drags the second boss...
Right here. This doesn't overlap the mobs, then. AMG PEW PEW. DPS goes crazy on the second add then the third add spawns and the third tank then picks it up and puts her riighhtt.....
there.
Again, they swap to the second dood. Bam, bam, bam. Yadda yadda yadda. Then, the third guy spawns right at the spawn point and dies almost immediately. It's taunted by the second tank but dies before it can do anything of harm. (Plus, 1000% additional damage of 1500 is still 16500, even assuming a crit - it's 33000 - which doesn't happen). So I'm not going to bother to draw that out on GIMP 'cause I'm lazy.
When the DPS swap to the first add and kill her, the add tank just moves over to the original position of the first add so the SPAWNED add will no longer overlap (again - one overlap doesn't kill anybody). It'll look a little like....
Then the strategy continues until we win.
Dude. That was an intense boss. Props to you - I can't wait for the rest =P.