Fundamentals and Practice of Demon Alchemy.

This is a book that Ringer borrowed from the Demon King's Library, written by Sain's great-grandfather, Halmes, a demon king who reached the pinnacle of demonic alchemy.

Ringer has been reading this book for a while, and he has already read the contents of the book, but he is still a long way from fully understanding it.

There was at least a third of the advanced content in the book that he could not grasp, and those that required a grasp of alchemy

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