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❝𝕬𝖓𝖙𝖎𝖈𝖍𝖗𝖎𝖘𝖙❞
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Spieces
Demon is a very loose term for a being of power, manipulation and sin. Demons can vary, based on abilities, appearance and motives.

Evolution
Demons used to be a basic and blunt term, as all demons used to be the same. However, over time, demons started to focus on different motives, therefore, evolving to fit them. Such inculde: Operators, The classic "make a deal" ones, Succubus/Incubus, Sleep paralysis, etc. 

Advantages.
•Magical abilities.
•Longer lifespan.
•Manipulation.

Disadvantages.
•If someone sells their soul to them, the demon must for fill their side of the deal.
•They can be cast out and banished.

Deadly:
•Bibical/Religious ceremonies- for example, exorcisms.

Extra information
Demons are a well known spieces, and, are somewhat feared because of their range of powers.