Just ran a regular 10 wave onslaught and after we killed the boss, the encounter wouldn’t end. No rewards dropped.
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Samething happened to me, thought they patched this.
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Kill the boss more slowly.
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Just had the same thing happen on a regular 10 wave. Got to the end, killed the boss, then tormentors spawned. We managed to eliminate all the tormentors, and then nothing happened. No rewards ect.