I've noticed a lot of people thinking the grimoire for Oryx's daughters is located in the King's Fall raid. That information is incorrect. The grimoire for these two Deathsingers can be found in the "Last Rites" mission on the moon (the one where you go into Crota's End). If you found this video helpful, please bump the thread so more people can obtain the grimoire cards for these two lovely ladies. Thanks for watching!