When the ghosts show up, they are not hostile. The ghosts with a blue aura can be pulled without worrying about aggroing more ghosts. The ghosts with the green aura act as normal though, so if you pull one of them, you will pull all the nearby green aura-ed ghosts.
For every ghost you kill, another will show up, walking towards the magnet. Use that to your advantage by pulling new ghosts before they get too close to the magnet. If ghosts aren't showing up or if all the existing ghosts have the green aura, just wait for your magnet to decay. All the ghosts will disappear and you can place a fresh magnet.
Quest
Ghost-o-plasm Round Up
A World of Warcraft quest in Desolace. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
Place the provided crate atop the little hill at about 63,89 to use the crate and summon the ghosts.
Be warned they curse you with "Curse of the Fallen Magram" which increases all damage taken by 15%.
Quest facts
The client quest POI data records no map location for this quest, so no map is shown.
Check whether you have already completed this quest
in-game: /run print(C_QuestLog.IsQuestFlaggedCompleted(6134))
Description
There's a valley to the southeast, the Valley of Bones, haunted by Magram ghosts. Sounds scary, doesn't it? Well think how scary it is to the Magram! If we captured ghost energy from that place, I bet it'd be worth plenty to those centaurs. Here, take this crate of ghost magnets. If you place one between the two big skeletons in the valley, the Dead Goliaths, then ghosts will wander to it. Distance yourself, take out the ghosts and get their ghost-o-plasm--that's what we'll sell to the Magram.
Community notes from Wowhead · 59 comments
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Reward details
Pick one of these
Item facts are the current retail client’s (ItemSparse); the specialisations for a pick-one item are the ones the Blizzard quest API lists; faction and currency text is the client’s own. Lowest listed price = the US commodity auction house now.