You still need to complete the 2 plate puzzle encounters throughout the raid (where you have to kill al enemies before the timer runs out). Getting all the essences was only part of the overall process.
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Okay, so my collections says the catalyst is completed because I got credit for the Oversoul lucky drop. I had completed the plates puzzles before helping friends, but I hadn't gotten the Nechrocasm for myself by that point. I still need to go back in and do the plates with Nechrocasm to obatin the actual catalyst. Thanks!
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