"To form a Nascent Soul, besides cultivating to Perfect Core Formation... you must overcome three great trials. First is Breaking the Core to form the Soul. This step is fraught with danger, testing the purity of a cultivator's Magical Power. If their foundation is unstable or their cultivation is insufficient, they won't even be able to form a Nascent Soul..."
"Then, there's the Heart Demon Tribulation... When a Nascent Soul is first formed, it enters a chaotic state, making it extremely vulnerable to Heart Demons. After all, the saying, 'The Celestial Dao is unkind; it treats all of creation as straw dogs,' is not just empty words. Heart Demons are a type of living being, so the Celestial Dao naturally leaves them a sliver of a chance at survival. This so-called chance is the opportunity to possess a cultivator breaking through to a higher Realm. If they succeed, they can be reborn into a new existence."
The origin of Heart Demons was already well-known among cultivators.
