Each Incarnation is independent. At birth, they are no different from mortals, but they can grow stronger through cultivation, and their choice of Cultivation Technique is not restricted by the main body.
In an emergency, a weaker Incarnation can use a Secret Technique to communicate with the main body and borrow its immense power.
It's worth noting that while an Incarnation can gain the main body's combat prowess this way, it is essentially burning its own life force in exchange for power. Therefore, the weaker the Incarnation, the shorter the duration of the borrowed power.
Moreover, the consequences of using this Secret Technique are severe. It causes the Outer Body Incarnation to perish, so it can only be used as a last resort.
'It's kind of like a divine possession,' Lü Zhong mused.
