The word “monster” derives from Latin “monstrum,” an aberrant occur- rence, usually biological, that was taken as a sign that something was wrong within the natural order.
 Ancient Greco-Roman, Celtic, Semitic, Norse, Chinese and Sumerian folklore all had a wealth of legendary beasts. Some of the most famous include dragons, werewolves, ghosts, vampires, witches, zombies, chimeras, Cyclops, hydras, etc.

Monsters are commonly used in fantasy or role-playing games, especially role-playing video games, when a large number of enemies to fight against are needed. However, the idea has been used across every genre to varying degrees. These can include aliens, all types of legendary creatures, or mutated versions of regular animals. However, sentient fiс- tional races are usually not referred to as monsters. The word connotes something wrong or evil; a monster is generally morally objectionable,
physically or psychologically hideous, and/or a freak of nature. It can also be applied figuratively to a person with similar characteristics.