After finishing up the Evernight Temple area I go south towards the last set of islands. Since the World Quest was closer I did that first before the main one. While I had the wrong idea I still was able to solve the slate puzzle pretty quickly, undeserving. They don't explain how Bunkoku was able to use vengeful spirits or what the treasure actually was but oh well. The Light Realm Core came from completing the quest.
0:00 Finish Exploring Evernight Temple
24:52 Going To the Serpent's Heart
31:00 Finding Last 2 Slates
41:17 "Solving" The Slate Puzzle
49:40 5th Light Realm Core Get
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