I am really hoping they would return and wage war with us and the covenant, because they view us as a inferior human form. And just hate the Storm because they are xenophobic.
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Whilst it would be cool. Especially with the "You know we have no choice. Cleanse the Planet" line which gave me chills. Really showed off their power. It just wouldn't fit with the universe, unfortunately they all died, maybe recover a bit of their tech but thats about it,.