There are many beings/&"things" mentioned in the Grimorie cards but it is in fact subject to interpretation as a moderate amount of data is somewhat vague.
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The mention of hive gods yes. Nothing talks about 9 kids of oryx.
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Crota's siblings. I think it was 7 others now. If Crota is has siblings, oryx is most likely the father..
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Yeah that isn't in the cards about crota having siblings. Tho there is a descended of oryx. Urrox.