I don't understand.. someone can explain?

It's a world where gods are born as humans and then descend when they become adult (basically become gods again and leave their human body).

Alongside them, a beholder, who is Iike maybe the caretaker of the said God, is born, who also has the privilege to not be scared of God and at the end, to provide the jewel of the God to the shrine, it's like a symbol of that God.

The extra scene is of after the ml descended, he's still with mc but not physically