To do this trick you need to be a lock (but a hunter probably works as well). Using the pet trick as explained in another thread on this board, summon your pet, get an infection, mount up and die from falling damage. You should now be a zombie with your pet out.
Here's the little innovation - Argent Healers have no melee attack. Simply stand outside of their ranged attack radius and send your pet in to whittle them down - they only have 4k HP. Then enjoy being a zombie freely around places like the shatt fp, etc.
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