–Lolupdate!–
This exploit has been officially nerfed. 4 piece now stacks once, no further. Also, downranking is now much harder than before and would make this method impractical in itself.

51/0/10 Affliction
Wrath Beta build 8714
4/5 Tier 5

Since everyone asks… MUSIC:
Artist: Henry Gregson-Williams
Song: Gekko
Album: Metal Gear Solid 4 OST

ALSO BECAUSE EVERYONE ASKS:
The mob seen in this video that is immortal is called ‘Servant of Allistarj’, a level 54-55 NPC in the blasted lands. More information on it (and why it doesnt die) can be found here:

http://www.wowhead.com/?npc=7670

Basically the bug goes like this. We take a level 70 or higher warlock, put them in 4 piece Tier5, spec them 50 points affliction at least, put corruption up and spam shadowbolt for a few minutes. Eventually we see absolutely retarded dps output.

What is happening is the 4 piece T5 bonus stacks indefinitly (even in TBC live right now it does). This was never an issue before because you could never recast corruption after getting buffed by this bonus, and it would drop off before it would ever reach values this high. However, due to Everlasting Affliction resetting the corruption timer… yeah. And you thought SWP was an OP dot.

Also, mathcrafting has been done on the nature of WoW’s 32 bit programming.

Maximum damage you can do per hit is 2^32 (32 bit integer, since WoW is a 32bit based program)
or
4,294,967,296.

That’s in a SINGLE hit. Of course, Corruption is a DOT, with 8 ticks.

4,294,967,296 split into 8 ticks is, of course, the infamous 536 million tick, or 2^29.