This is impossible to find. I've had to submit a GM ticket because we have searched 40+ rifts and have yet to find one that we've either not completed or know doesn't spawn the Netherling Caller (because we'd completed it during the search).
We need it for the "Forces of the Planes of Death" quest and we've been at it for about three hours, now.
Absolutely ridiculous.
I don't even know what Rift spawns it!
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