The key is still the Divine Sense.
This is also the biggest obstacle that holds many back from making a breakthrough.
Even though the Divine Sense can transform during the Nascent Soul Formation, if a Heart Demon assaults, it is very possible to fail due to a moment of distraction.
However, there are targeted methods for this kind of thing within the Immortal Gate.
Whether it's consuming elixirs or using magic artifacts, one can avoid it during Nascent Soul Formation.
For this reason, Chen Mobai had specifically asked Master Chengxuan to refine the Lifespan Artifact Morning Bell.
But the Formless Puppet's deduction of Nascent Soul Formation can only start from the most fundamental level, and for the time being, elixirs and magic artifacts cannot be added, so Chen Mobai's simulated process of Nascent Soul Formation ultimately still fell at the hurdle of the Divine Sense.
