No, you don't need to kill him at all
Actually kind of the opposite you need him to be killed in order to NPC Eruaran to appear in top of the mountain and get the Dream Warden outfit and addons ( Both items for addons are dropped by Gaz'haragoth)
But in case you only want to finish the quest itself, you don't really need to care about him at all
He is not linked with the quest more than because he drops the mount and addon items and that's not really part of the quest is just some rewards from few missions
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