For centuries, we have believed in supernatural deities and afflictions caused by malevolent spirits. But these dark beliefs have proven to be more than simple evil; they serve as plot devices in their own ancient histories and sources. And in modern days, we still feature demonic characters both serving the good and bad. Here are the top three demons in mythology that have inspired various works of fiction.
1. Azazel

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Azazel is a very well known name throughout the world. Islam, Christianity, and Judaism all recognize the name in some way, shape, or form. However, the name Azazel is most commonly noted as one of the many fallen angels who followed Lucifer in his downfall.
Azazel is noted also as being one of God’s strongest and most intelligent lieutenants in the angelic army. After supposedly being cast out, the demon is referenced in the Dead Sea Scrolls. Azazel was primarily held responsible for teaching man the ways of brutality and warfare. With his influence, the fallen angel supposedly corrupted most of humanity.
The name Azazel has been given to a number of characters and works over the years. Both Marvel and DC have characters with the name that exist in their separate universe, and there are various literary works with the title such as the novel series by Boris Akunin or the 2008 novel by Youseff Ziedan.
2. Leviathan

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Many people fear the ocean, and we may have this huge bestial force for instilling this fear into us. The Leviathan is mentioned several times in different mythologies and stories of old. Most often, it is depicted as an enormous fish or other huge sea dwelling animal.
The Leviathan’s role is seen as somewhat of a rampaging beast, as well as a victory or sacrifice during the end times. It is hinted that when the world will end, the Leviathan will perish and feed humanity. Yeah, that’s how big it’s supposed to be.
This huge demonic being has been an inspiration for countless sea monsters in literature, film, and even history. Many sailors wrote about their encounters in strange new seas with unknown, huge monsters that dwell just below the waves. The Leviathan has inspired the likes of the Kraken and features in a multitude of films.
3. Oni

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The Oni are a class of supernatural spirits of Japanese myth and folklore. As a type of yōkai, these beings are able to accomplish feats that humans can only dream of. Oni are born when corrupt and immoral humans die and are reincarnated in one of the Buddhist Hells.
Oni are usually depicted as enormous, hulking ogres that mainly carry around huge clubs as weapons. They are often depicted as antagonistic towards humans and are mainly villainous in their roles in many stories. They terrorize mankind any way possible, and will even resort to eating humans as a form of consumption as well as spite.
The Oni have gone on to inspire even more stories about themselves as years have passed. They have been included in many Japanese fairy tales such as Momotaro among others.
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