I've been playing onslaught, and I got stuck with an immune tormentor. Nothing will damage it as it walks around flashing white. This was round 13. Me and my team couldn't progress.
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Just had same issue. Tormentor went immune completely after breaking shoulders.
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Same exact thing happened to my fire team last night. First tormentor we fought went normal. Wave 49 tormentor went totally immune after breaking his shoulders. No damage numbers, shots went right through him as he smashed on shaxx. Just flashed white and no health bar. Ruined the whole run
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Did you break the shoulders?