Hello, for some reason I can't equip the weapon catalyst. I've already fulfilled the requirements, and in my history it says I've completed it, but I can't select it to apply it to the weapon.
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The catalyst for Necrochasm comes from doing the 2 gatekeeper mini encounters (Bridge, Ir Yut). You can do the requirements to complete it (and the triumph) prior to earning it, but you can't apply it until you do the mini encounters to actually obtain it. https://www.youtube.com/watch?v=AvG23OSRHqc
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You still need to do the puzzle in the raid to acquire the catalyst itself.