If you read the lore they’re here to gather Ghauls troops who are stranded & return to Torobatl. I found it pretty interesting. Unfortunately the Cabal are too proud to simply ask.
From the description in lore Xivu Arath showed up & completely overwhelmed Torobatl. The Cabal were arguably the strongest organized military around & the hive conquered them easily.
Cabal, Fallen & Guardians need to stop killing each other.
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Screw her and screw the cabal. They just made a guardian killing device and you wanna be her pal? I'd rather hang with the hive.