This is a video of Bloodreign, a shadowpriest on Black Dragonflight US, soloing Bloodlord Mandokir (the raptor boss) in Zul'gurub. As far as I know, this is the first time is has ever been done as a priest.

It took around an hour and a half to learn it and get a good strat going to down him. If any other priests feel like trying this, feel free to log on my server and ask any questions or just send me a private message here..