The second human form should have already passed the juvenile dragon phase (infant stage).
The most representative feature is that it finally no longer needs to sleep incessantly, replaced by a normal giant dragon's rest times, along with a very unique 'hibernation' indicator.
It cannot be actively activated, but there is a progress bar that can be triggered once filled.
—"Hibernation (Special Ability): The giant dragon begins to enter a state of deep sleep, requiring an advance intake of large amounts of food, and its body indices must reach the critical points of the current stage. Upon entering hibernation, the dragon will develop rapidly and further transform, directly skipping the current dragon age period.
During hibernation, the dragon's scales, claws, teeth, skin, etc., will all be further enhanced, while muscle and skeletal development will improve basic attributes."
Currently, this progress bar is only about one-third full.
