Michio enters the labyrinth with Roxanne and learns more about the world. He realizes the actions he'd been taking based on assumptions have been terribly inefficient. With the knowledge he learned from Roxanne, common video game strategy, and skill settings, Michio develops a method to efficiently make money.
They're formed through the 
accumulation of monster skills.
Se forman al acumular las habilidades
que poseen los monstruos.
Se forman al acumular las habilidades
que poseen los monstruos.
Des cristaux qui ont emmagasiné
les aptitudes de monstres.
Si formano con l'accumulo delle abilità dei mostri.
Eles são formados com o acúmulo
de habilidades de monstros.
Насколько я знаю, в них понемногу
накапливаются навыки монстров.