When Laura and the others had first obtained the curse runes, they had not been in a hurry to make a curse array. Instead, they had first studied the runes to see what they meant before making a curse array.
After studying it, Laura and the others discovered that the cursed array runes had endless wonderful uses. This aroused their curiosity. They also wanted to know if those ordinary array runes had the same use, so they immediately started to study it. After studying it, they discovered that those ordinary array runes didn't seem to be that simple. However, there were too many ordinary array runes and they were too profound. It was basically impossible to understand them in a short time. Therefore, Laura and the others began to study the curse runes and made a curse array.