This is a Complete C+P Post
C+P'd from Here
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This Exploit is Relatively Pointless But it Works
To understand this exploit, you may need to have a rudimentary understanding of the Kael'thas encounter.
The bug is simple enough, and serves little purpose beyond unfair advantage in topping the DPS meters as any class with a DoT effect (although, in case of Shadow Priests like me, it serves as that much extra mana return).
All of Kael's advisers (Thaladred the Darkener, Master Engineer Telonicus, Grand Astromancer Capernian and Lord Sanguinar) die in phase one. Their corpses are un-clickable.
The bug:
DoT effects continue for the duration left when any of the Advisors die. IE- A warlock may, at 10%, refresh all of his DoTs or better yet, put up Curse of Doom. Shadow Priests refresh SW:Pain, Vamp Touch, Starshards if applicable.
Warlocks, fellow Priests, enjoy that much extra damage in the meters.
Yours,
Alkhara Majere
Vaeritas
PS- Unsure if this can also be done as each adviser dies in Phase 3.