Blight kill not spawning glyphkeeper fast enough, delayed spawn causing team wipe due to time constraints. Please take a look.
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Our clan had the same issue last night. And we made sure to kill the taken. Had to reload the encounter and it worked. (But we lost the double chest at the end of the raid!)
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Glyphkeepers don't spawn off the blights. They spawn when kill the corresponding taken snipers on each side. The encounter is not bugged (having done it myself earlier). You just need to be faster.