In World of Warcraft Patch 7.3.2, Blizzard added extra environment files, used as assets for the sky/stars. While these look similar to those used in the Star Augur Etraeus fight, we have confirmed these are new to 7.3.2.
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Warning: expansion speculation and 7.3.2 spoilers in post.
The new void-themed files are used as assets for the sky/stars:
We are speculating that these could be related to the Wound in the World, in which Sargeras throws his sword into Silithus, potentially awakening the Old Gods. Perhaps there is a larger skybox that requires more corrupted planets--like an alternate vision of what could be if the Old Gods took over. Again, this is just speculation on our end, as with any speculation it's unofficial and could lead to nothing.
We first saw planets consumed by the Fel and Void during the Star Augur Nighthold fight. In this encounter, he showed us several different visions of the sky referencing different threats facing planets, which parallels he progression of Azeroth:
When Phase 3 starts, he says:
Star Augur Etraeus yells: Is that not enough? Must I show you the true horror of our reality?
Star Augur Etraeus yells: Very well... witness what I have seen, and TREMBLE!
Star Augur Etraeus yells: These are the beings who will devour the future you so futilely fight to protect!
Star Augur Etraeus yells: Avatars of non-existence... knowing nothing but hunger.
Based on these visions, it looks like Phase 1 is the past, Phase 2 is Legion, and Phase 3 is a Void/Old God future. Perhaps we'll return from defeating the Burning Legion only to see the Old Gods have been at work in Azeroth.
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