Fantasy novels usually involved many different levels of power. These powers could be physical forces such as magic, swordsmanship, etc., or spiritual forces such as faith, soul, etc., or supernatural forces such as monsters, gods, and ghosts. In fantasy novels, these powers were often seen as a " power system " in which different elements or abilities could combine to produce different effects. For example, a mage could use magic to attack enemies, but he might also have some items or spells that could increase his or others 'strength. In fantasy novels, strength was often a key element that determined a character's ability and range of action. Different characters usually have different power systems and these powers will change or interact in different plots. Therefore, understanding the power level in fantasy novels is very important to help readers better understand the character's ability and the development of the story.