The first thing is these few Cultivation Techniques: the Magic Cultivator's Canglan Nine Tribulations Sword Manual and the Yin Transformation and Spirit Absorption Book, both are cultivation Magic Techniques that lead straight to the Nascent Soul.
As for the Sword Manual, Ji Yuan once swore an oath that it could not be passed on.
But this Yin Transformation and Spirit Absorption Book was the desperate gift of the Sea-Crossing Old Demon; if he wants to sell it, that's not impossible either, since he's already received the inheritance anyway.
Next is the Body Cultivator's Nine Revolutions Profound Yang Skill. Judging from the reaction of the Martial God Tower's Artifact Spirit, if this Cultivation Technique were to spread, let alone a mere Cloud Cliff Temple, even if it were placed in the legendary Martial God Continent, it would probably stir up a raging storm.
So this also cannot be passed on.
