To "summon" this creature, you have to kill a couple of mist creepers, and wait for the mist to surround you, and then the Mist Horror will show it's ugly face.
I ran into a snag on this one. Killed a couple dozen Mist Creepers and never got the Horror to show up. Not sure why, but I wound up abandoning the quest (which is a nuisance, since the plotline is linear and you can't move on in the story without it).
There is a solution for the issue of this creature not spawning in 5.1. View it via the link below.
When you are killing the Mist Creepers you will be surrounded by ... mist... at some point you will see a message saying "You are being haunted" when you do, there will be a clickable mist cloud near you, click it and the Mist Horror will appear.
As posted by Sylviannas, there is a fix. To clarify: simply log out, and log back in. Reloadui does not work, you have to actually log out, but you don`t have to turn off the game.
After you kill eight
, but you exit the zone or for some reason don't get to kill the
will spawn and follow you around, you can force it to appear by exiting the sub-zone and entering again, your screen edge turns orange and this fella spawns. Click it to summon the quest NPC.
Very poor quest text on this one. To summarize how to do this quest:
1) Kill 8 mist creepers. You should see a "mist" effect fill your screen.
2) If you don't see the mist, don't bother killing more creepers. Instead, run back to the quest giver and then return to the bog.
3) This will force the mist effect to appear. Move your cursor to the small spot in the center of your screen where your hand cursor turns yellow.
4) Click and the Mist Horror will appear. He is an easy kill and the heart has a 100% drop chance.
这个 NPC 能在这些地区找到：
[Screenshots containing UI elements are generally declined on sight, the same goes for screenshots from the modelviewer or character selection screen.]
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