Problem is we've seen the inside of a servitor and it sure as hell doesn't look like a shrieker.
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Where have you seen it?
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The Reef. You know about the ball that you can roll around and destroy and shiz? That's the inside of the servitor used by Variks as an intercom in the Prison of Elders.
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It could be some sort of makeshift fallen shell like the Hive did, and theres still some void light goin around in there.