Hey there I was working on getting my izanagi before beyond light. I was first working on my key mold everything went fine but when after I did the bergusia forge for the key I tried finding the quest again in my quests to do the rare bounty. but I couldn’t find it anymore it disappeared I still have to do the box too I need 2 more keys do I have to wait till I’m done with box and then I can do the rare bounty and shattered and stuff or did it just just disappear.
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Getting the key completes the key mold quest, the step requiring the rare bounty comes after you've unlocked the Mysterious Box with all four keys.