It was a cursed ring that made it almost impossible to use mana. There were several of these limiters. These rings were made 200 years ago after the last demon war. At that time some demons were captured to analyze them. In order to render them harmless, the ring was put on. This ring not only reduced the mana but slowly absorbed it until the wearer was unable to use any magic. After some time, these demons were just cripples. The spell on the rings was created by Archmages to avoid possible dangers like these demons. After a few years the use against humans was allowed even if this could mean the crippling of the person. The ring first manifested itself in the finger. But if the curse was in danger, it could be all over the body. Only when the person is dead the curse will be lifted. Each of the five archmages created one of the rings. One of these magicians took his ring and hid it because he could not accept its use against simple people. Soon after, he took his own life before he could be persecuted. However, the ring was later found and handed over to the royal family. Nothing's been heard since. According to the information, the ring dissolves after application in the finger and leaves a seal in the form of a black circle, which dissolved itself after the death of the person.
