Ancient and powerful evil
From WoWWiki
The ghostly arakkoa of the Dark Conclave at Sketh'lon Base Camp in Shadowmoon Valley are trying to summon a creature of ancient and powerful evil. The abomination's purpose was to bring death and destruction as a last ditch effort to stop Gul'dan, who was a threat to the arakkoa as well, from creating the Hand of Gul'dan. It resembles the Old God C'thun, and may have a connection to him, or his kind.
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If this is indeed an old god summoned to Draenor, it may have something to do with Anzu being in Outland and the arakkoa worshipping it.
