So yeah, today me and a couple of friends decided to kite this mob down in Feralas...
http://www.wowhead.com/npc=3936#comments
Name: Shandris Feathermoon
HP: 68M
Kite-able from Feralas to anywhere in Kalimdor (Orgrimmar and such)
Now you all might think: "oh big deal, some kiteable mob..." but here is the fun part: Her abilities...
■Her arcane shots? hit for 20k. Second time kiting her, it seems to vary between 20k to 50k.
■Her aoe moonfire has a 5 second cast time and a duration of about 5 seconds. From what I viewed it ticks for 20-25k, 3-4 times per second.
This kills EVERYONE, so if you pull her to the AH in Orgrimmar she will simply kill pretty much everyone rather quickly once the Moonfire goes up.
We did it with 1xHoly Pala, 1xProt pala and 1xDK (Very useful for slows) she is pretty easy to kite, the healer just needs to know what he is doing, we used about 15-20 mins to kite her and managed to keep her at 98% as we entered Orgrimmar (The DK only used a couple of dots and the tank taunted off when needed)
Found this video on youtube aswell: http://www.youtube.com/watch?v=fHJ9fJmsDuU about 3 minutes in you can see a moonfire, obviously alot of people dies from it...
Tl;dr: Kite a mob from Feralas to Orgrimmar and destroy the AH...
(List of abilities was pulled off a comment on Wowhead)