I have never had the shriekers not spawn for me, but I have been killed by the song 2 min after Ir Yut was dead. The wizard was down, we were clearing out all the adds and instead of the "next mission" alert we were all instantly killed by the song and had to do it all over again.
English
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My team got mad and quit because of this glitch spent about 45 minutes trying to e beat her and every time she was dead a few minutes later we died from the song
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Yeah it's bull shit.