You must wait he kills all the neutral before to engage him, or he will simply depop. I tried 3 times before to understand that ...
Quest
End Arcanimus
A World of Warcraft quest in Dragonblight. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
Arcanimus is located at 20, 59.5 directly to the west of the quest giver in the crater.
AyaJulia is correct. Fly/Ride in close to Arcanimus. Place yourself on the ground near him. Let Arcanimus attack you first, don’t attack him first. After that, he’s an easy kill.
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(12013))
Description
There is one last thing that I would have you do, {name} the {race}. I would have you destroy Arcanimus! The sorcerers to the west used that giant device in the sky to bore a massive pit into our resting place. When they did that, they unleashed a monstrosity! I would not care if it were only a concern for mortals, but Arcanimus feeds upon the spirits of the dead. You will put an end to it now!
Community notes from Wowhead · 23 comments
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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.