Destined Person
Sam's estimated construction time would be around three months. After this is over, it is time for him to go back.
After these three months, there would be approximately one year and two months before the next palace of inheritance.
And the one-year grace period is necessary for him to have a proper development phase in the realm the Palace of inheritance is going to be held.
So, in these three months, Sam has to find a beast that is suitable for his next breakthrough. He is focused on the wood elements.
But before that, he has to do something else and that is catching the sea urchins.
If he didn't catch enough sea urchins, then that would be a waste. These things are going to be one of his new defense mechanisms and he would even send them to his different bases.
His city, the western continent, the former Usain sect's land, and the minor power islands he had.