A kiss

 Her mother being poisoned was the truth, but in reality, she could be healed if she abolished her cultivation.

She would have done this if not for what she learned with Edward. They then colluded together, creating a plan to achieve two things: the unification of the Blue Jewel planet and exploration through the rift.

As for MingYue and MingHao, they just hoped both of them would have enough strength to protect themselves. That is why they never gave them anything that would make them stand out.

Instead, they kept all their resources, techniques, and every single piece of their knowledge hidden inside the storage amulet. Both amulets were created by Edward. They utilized a similar mechanism to the one given to Luca.

If Alex had his emotions, he would be shocked by his father's decision. How could he do that? Leaving behind his family like this?

Couldn't he go home with his own soul first, then find a way to recover?