Daemon

Demons (or Devils) [悪魔, Akuma] are existences like Spirits or Angels. They received power from the Spirit of Darkness and specialized in demonic attributes. When they do not have a body they exist in the Underworld (Hell) where they mostly wander aimlessly around. Also the majority of the Demons do not have names or any sort of attachment to themselves. There are a few exceptions which include those that have developed an ego after being summoned several times and having contact with the world.

Demons will fight constantly by shooting energy at each other. As they fight more they will evolve and get stronger. They can also gain Unique Skills.

However it takes a very long time of constant fighting to evolve even from a lesser demon to a greater demon. Making those of even higher ranking even more rare.

Summoning
It means to be summoned from the Underworld (spirit world) to the material world. A temporary physical body can be obtained and the pleasures of the surface can be experienced (smell, touch and taste).

A summoned demon without an ego will be affected by the personality of the summoning master. Depending on the summoners request the Demon can receive great amounts of information through Souls and with enough souls collected the Demon could evolve into a higher being.

Summoning chooses the appropriate demon(s) with the appropriate rank for the tasks. All of this occurs naturally.

Once in the material world first an Ego arises. Each summoner provides more information to the demon allowing them to become more powerful with each summoning.

Other Information
To stay in this world a Demon needs a body; animals and monsters are often used to that end.

Demons are beings who are generally summoned into this world as spirit being that need to occupy a body in order to remain.

However it is possible for monsters (Demi Human and Magical Beast) to evolve into Demons given that they are strong enough and have had enough time to evolve.

Demons and strong monsters are often referred to as Devils.

Types of Demons
Demons can refer to one of two things.

Race
This refers to the demonic spirits that are born as balls of pure energy (and also what this article is mainly about).

Their hierarchy, from strongest to weakest, is as follows:
 * 1) Demon God (Highest tier Demonic Spirit)
 * 2) Demon King (High tier Demonic Spirits) <-(Unconfirmed)
 * 3) Demon Noble: Demons who have Magic Amount above EP: 200.000. There are further ranks among Demon Nobles:
 * 4) Duke: EP: 400.000+
 * 5) Marquis: EP: 350.000+
 * 6) Earl / Count: EP: 300.000+
 * 7) Viscount: EP: 250.000+
 * 8) Baron: EP: 200.000+
 * 9) Knight / Chevalier: Weaker than Arch Demon but Surpasses Greater Demon and could 1-hit-kill a Greater Demon. The lowest of the Aristocracy.
 * 10) Arch Demon: Demons whose Magic Amount is EP: 100.000+. Also, this is the highest stage to which the Demon evolution is locked, unless a demonic being (Guy Crimson) is able to gather all of the Sin Series Ultimate Skills (to reach the highest evolution of Demon race), is Named or granted Souls.
 * 11) Greater Demon: Demon whose Magic Amount have EP: 9.000+
 * 12) Lesser Demon: Demon whose Magic Amount have  EP: 5.000+

Title
A demon 'Title' refers to anybody with great strength and notoriety. Such is the title of a Demon Lord. The hierarchy, from highest to lowest, is as follows:
 * Great Demon Lord: A being known to have multiple True Demon Lords or Demon Lord class beings as their subordinates. A clear difference in standpoints.
 * True Demon Lord: Just like the name suggests, they are the individuals that have sprouted their Demon Lord's Seed and thus, have been approved of by the Voice of the World to be titled 'Demon Lord' in its truest sense. Their strength are in a completely different caliber compared to the 'self proclaimed' Demon Lords.
 * Demon Lord: This refers to any species possessing fearful might and notoriety. They do not possess or have not yet sprouted their Demon Lord's Seed. As such, some are also called 'self proclaimed' Demon Lords.

Trivia

 * Members of the Demon Race are beings who are compatible with Darkness or Demonic Attribute. Examples for this are Demons and Devils.
 * A Demon is pure Darkness Spiritual life form that has strong mind and ego unlike Human and most other spirits.
 * Devils are Demi Humans, Beastmen or Magical Beasts who are strong enough to evolve themselves into Demon Race.
 * Most Devils don't have a Spiritual Body while most Demons don't have a physical body.
 * The main reason Demon often become incarnations of evil is because they are summoned for the first time by Humans as Lesser Demon and have yet to gain a strong ego or develop one, they will receive magic and information about Physical world from the Summoner and inherit the Summoner's personality.

Демоны