Dungeon Fighter Online (Dungeon Fighter Online) was a Korean game where ordinary souls and advanced souls were two different types of souls in the game. A normal soul is a low-level soul that is usually used to make normal equipment. High-grade souls were a type of higher-grade soul that was more precious than ordinary souls and could be used to make higher-grade equipment. High-grade souls usually required more soul crystals and materials to make. In the game, players could obtain soul crystals and souls by defeating monsters and completing missions. Soul Crystals could be used to purchase souls, while souls could be obtained by challenging Dungeons or opening treasure chests. Soul Crystals and Souls could not only be used to purchase Souls, but they could also be used to upgrade equipment and create high-level Souls.