In the game," Petrification " was usually a curse spell. Curse magic can apply a magical power to the target, making it immobile or immutable for a lifetime. This power could be negative, such as causing the target to fall into a coma or permanently paralyze, or positive, such as making the target immune to certain attacks or possessing certain special abilities. " Petrification " was a very powerful curse spell that could cause great damage to the target. It usually required very high magic strength and skill to cast it successfully. In the novel, many characters were affected by curses and became immobile or immune to attacks, which often became the beginning of their tragic endings.