You need 5 red border extractions to craft it.
You have 1/5 currently. You can see how many you need for each pattern by going to collections -> patterns and catalysts
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Thank you, I wasn't aware I needed multiple, how do I get it aside from Mara?
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Last Wish raid encounters can drop it. This week is the featured and Kalli is a quick farm - used that encounter to finish up my last 2-3 patterns a while back You can open the 2 secret chests in it for a chance. If you have ones that drop without red border on them you can use Harmonizers (if you have any) to apply a deepsight to it. You can get a guaranteed 1 per week from doing a full Last Wish run (pick up the quest weekly) and buying it from Hawthorne, you could also potentially get it as a quest reward for doing the full run provided you picked up the quest