I defeated these "Daughters of Oryx" many times but they never unlocked for me.
I wonder if this will be fixed soon?! :)
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Hi, Bungie is aware of their grimoire cards being bugged and not unlocking. https://www.bungie.net/en/Forum/Post/106391116/0/0 At the moment the only way to get their grimoire cards is to kill them during the [i]Last Rites[/i] mission on the moon