He has two main options on what to do with his merit points. He can keep his merit points for game points, or he can use them to exchange for tangible stuff from the Yggdrasil civilization.
If he had enough merit points, he could exchange them for a divine spark and become a demigod. It is the option available to the other earths since they don't have a tower of destiny anymore.
That is beyond him currently, but he can still exchange for energy stones, slaves from all over the Yggdrasil civilization, or he can have a weapon made for him.
He is inclined to the last option. But he will only go for it when he has acquired a weapon-class ability. For that he needs to exchange for a sparkion, as they have the ability to bind with an inorganic structure of their choice and use it as their body.
