I just found out about Crown-Splitter but I never got it, I finished the story I don't know if there is a npc that gives it.
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Cayde originally rewarded you with it after the Red War campaign. He would be there after you finished the campaign even after Forsaken, but once you relaunched the Tower he's gone. Since I've had these weapons for a long time now, they only seem to drop randomly from Year 1 destinations. I have found a 908 Crown Splitter on my Warlock in Shadowkeep from a random world chest on EDZ.