edit: as for the MP system, idk if it will affect what battle system I'm using...but I am using the victor's actor battle system.
as well as Lune's passive skills script

with the stone refinery shop, its somewhat like a blacksmith shop, or alchemy shop, where you require the attribute/mana stone, plus a certain item, and a refinery tool to refine the stone, into...a stone or something better than a stone such as a gem(if you can acquire a better certain item). Durability is dependent on levels. here's a picture to better understand.

sorry if i'm asking for two different things in this topic. I was only looking for an MP system, but decided to expand on it more...any other questions please feel free to ask :)