Quote Originally Posted by KrayZ33 View Post
But since he creates them, it seems they are not that complicated in the first place.
The thing is, the MC dude wasn't given the recipe for the stones. He reverse engineered them. There might have been factors Dia's clan figured out over the centuries, but some dude who was only interested in using the stones the "wrong way" would be blissfully unaware of. It's not like our world would be lacking cases of cheap manufacturing countries copying originally more expensive products to flood the market with them. Typically they are inferior to the originals.