for the quest Dun-da-Dun-tah! - Quest - World of Warcraft
Harrison Jones summons a snake blah, blah, blah.
Well while you are killing the snake these ghost like trolls spawn. Each one has about 2000 health, but the thing is they give full xp as if a regular mob. This could easily be exploited as they kept respawning as i killed the snake. Or just keep resetting the quest, hopefully this helpsI was getting 1600 xp rested from each.
these are the mobs
Ancient Drakkari King - NPC - World of Warcraft