(All info from Wiki! If watched the anime/read manga, do not read if you understand it all clearly! If not, try to read it! May be long, but it's shorter than explaining it all in completely detail! Yeah... looks long right? Best you just watch the first and second episode of the anime or read a few chapters or the manga instead xD)
Magi
Magi are "Magicians that shape the world". By using Magoi, they are able to control the world's Rukhs. Magi have the power to summon Dungeons, and to lead people in there. Magi bestow the magical items found in Dungeons to the people he leads. A Magi's job is to select a King Candidate and lead their candidate to become king. Exactly what one is supposed to do to achieve this is unknown. On the surface there are people who try to go against the guidance of the Rukh. When fate is changed even if people use all their strength it will not be possible to go against it. To cut through anddispel the darkness a power will be needed, a "Miracle". A miracle is the Magi's mission. To accomplish this a Magi must go to a certain place in order to achieve "Solomon's Wisdom".


Dungeons

Fourteen years ago a strange building appeared out of the ocean, this was the first dungeon. This strange place in an unknown culture and never before seen architecture appeared. It was indestructible with only one entrance with light emitting from it. Scientist took an immediate interest in it and before long thee was a line of researchers who wanted to investigate this phenomenon with numbers easily in the thousands. Eventually soldiers as well as the researchers couldn't contain their curiosity any longer and went to explore this mysterious place. However two thousand of them all met their end in this place and not a single person came back to tell the story of the dungeon. Not long did people start calling it "the hole of death".
Each dungeon is different in appearance and difficulty level. Each one has an different outer appearance as well as a different interior. This is because each Djinn that rules one are all different with different personalities. Since they can change the appearance as they see fit they all end up looking different. Dungeon's can change the level of difficulty depending on the person who enters which is controlled by a Djinn.

Djinn
Djinn are artificial life created from Rukh. Originally they could only be created from magicians who are loved by Rukh or Magi. They rule over Dungeons and they are able to change the level of their Dungeon's difficulty. They sleep deep inside their Dungeon, until a Dungeon Capturer reaches where they are. According to Amon, a Djinn should not materialize on the earth. The Djinn, in the end, is a pure power that a King of the earth uses, and King Solomon created them for that reason. Yamraiha has stated that there is a bad affinity between Djinn and Magicians, that in a certain sense Djinn are Magic users too and if a Magician uses a Djinn, their Magic could interfere with each other. For that reason, a Magician cannot be a King Candidate or a Household Member.

Kind Candidate
A King Candidate (王の器, Ō no Utsuwa) is a Dungeon Capturer that is rewarded with a Djinn. This person is chosen as a King Candidate regardless if they are led by a Magi, despite the candidate’s lineage or status. The right King Candidate chosen is to be the next Solomon.

Household Member/Vessel
Household Members are people who help a King Candidate capture Dungeons and forms a Household Vessel from that person's Djinn, or if they form a strong connection to the King Candidate. It seems that if the King Candidate does not have his/her Metal Vessel, the assistant can not use their Household Vessel.
Household Vessels are objects (weapons, jewelry, accessories, etc) that hold importance to the Household Members of a Dungeon Capturer. This person helps the Dungeon Capturer capture a Dungeon and forms a Household Vessel from that candidates Djinn, or if the assistant makes a strong connection with the Dungeon Capturer. When a Household Member first uses the power, a Familiar of the Djinn shows up and grants it to them. It seems that if the King Candidate does not have his/her Metal Vessel, the Assistant can not use their Household Vessel.

Rukh
"Rukh is the home of souls. While we live, it is every man for them self. But when you die, all go back to one place, This is Rukh. When humans die, their bodies return to the earth don't they? The souls return to Rukh, The home of souls." -Baba, telling Aladdin about Rukh

Magoi
Magoi is the energy created from Rukh. Magoi is pure power. Concentrating Magoi and firing it is not that powerful and can only be used to give slight injuries. All living beings have Magoi inside their bodies, but only certain people with certain objects can call forth this power. Metal Vessels, Household Vessels, Magic Tools and Magicians all use Magoi to use Magic. If a person uses too much Magoi, it can leave them extremely exhausted or worse, makes them bleed out their eyes and ears until they collapse.
There are ways to restore Magoi that include resting and eating to restore one's own physical strength. Magoi that has been stored inside a Djinn Metal Vessel can be restored by keeping it close to oneself for a few hours after restoring one's physical strength.
There is a another way of recharging the Djinn Metal Vessel Magoi by using the existing elements in nature as power. The element needed must be the same as the ability of the Djinn, and can only be used for one attack.


Magi
~OurStars

Dungeon Capturers
~OPEN (M)
~けい-ちゃん | |
~OPEN (F)
~OPEN (F)

Household Members
~けい-ちゃん | |
~OPEN (F)
~OPEN (M)
~OPEN (M)

Magoi Manipulators
~Unlimited


(May add more later on!)
(For those who will be a Dungeon Capturer, here is a list of Djinns you may pick from! Heads up! You don't have to used the same Djinn's names, although their Affinity (If listed) will not change, and you may make up their personality during the rp as well!)