C786 Imperial Jade Seal
The whole of Karakorum was actually a huge formation. Once it was slightly set up, no one would be able to discover the true Karakorum Savant's secret plane.
Yuan Beidou was able to deduce the crux of the matter from the Eight Trigrams rune he got from Fuxi's tomb. There was something else that had been left for him in the Kunlun Secret Realm