· Arcadia is a type of vital magical energy that is used to produce life on the planet of Ninjago. Magic feeds the planet and has even developed to create its own life, from there various beings and creatures are born that live thanks to Arcadian magic. Even this magic is used in different advanced technologies, such as medicine, weapons, defenses, science, alchemy among other things. The magic itself can be manipulated by the same creatures created from it or by different beings that may be able to control and understand it.

· Arcadian magic can be manifested in different ways depending on the type of use given to it by the living beings that are controlling it, and they can also manifest it in a great way in specific and ancestral places for magic, since magic itself also has some kind of consciousness itself. It is also materialized through objects created from the same magic, in addition Arcadian magic is capable of quickly adapting to different objects, as well as adapting to the needs of the planet with each new generation through the years, as well as in other universes or other planets.

· But this magic can also be corrupted, pure Arcadia can become Dark Arcadia or Dark Matter as many call it. This corrupt magic can create dark beings that are capable of extracting the life of other beings in order to survive, more apart from destroying life in their path in order to steal the vital energy around them, it is not easy to cure them, magic would be needed Arcadian strong and pure to make them pure. Dark Arcadian magic is not easy to control, but it is possible if the host has great determination both physically and spiritually, not being dominated by the power of this magic is the only solution not to be corrupted and controlled by the darkness of magic. . Another way that magic becomes corrupted and controls its host is through negativity, when a being presents weak and negative feelings, magic takes little control of its host and then becomes a single being, totally dangerous and corrupt.

· Dark Arcadia arises mainly from beings misusing their Pure Arcadian magic or when a place is critically contaminated and the beings that inhabited it take on a negative and corrupted form in their minds or bodies. Magic is born from the polluted soul of any being, an example would be when the wielder commits heinous crimes or when he feeds his magic with negative and depressing emotions, the greater those negative emotions or ambitions, the more corrupt the magic becomes in the wielder. , causing pure magic to become corrupted and transformed into dark energy. But this dark magic can also be created with the necessary ingredients for its elaboration, it is created mainly through alchemy but its elaboration is somewhat difficult and late, apart from the fact that the process can be dangerous and would even affect the health of the creator, it can also be short in process when the necessary materials are obtained.

· The beings who were first born through Arcadian magic called themselves "First Ones". His rumination was the richest, most peaceful and abundant of all thanks to his correct handling of Arcadian magic and its technological and scientific advances, as well as his advances in weaponry and defenses for his home. But for many specific reasons their race stayed away from the other primitive peoples of the planet, even so after many years several of its inhabitants shared their knowledge with different peoples and other beings on the planet, but even so they remained hidden.

· The home of the First Ones was called "First Kingdom", a place that very quickly became a simple fairy tale for children and its history was almost forgotten over the years. The history of the First Kingdom was formed thanks to its incredible fables of science and highly advanced technologies that would almost sound so unreal to any living being, it was also said that it was the place of origin of Arcadian magic, and that perhaps they know the secret of eternal life. Although it is true, its inhabitants may live a long time, but they are still born and die as normal living beings, they even grow old, but it is already the decision of the inhabitants themselves to want to live longer or not, and that is due to their incredible mastery of Arcadian magic. The maximum number of years the First Ones have lived is 100 to 200 years minimum, this also depends on their ability with Arcadia and their physical and health states.

· Several of its inhabitants left their home to explore their planet, the few of those travelers were the ones who told the story of their home, but they made sure that their home was kept secret, few of some inhabitants had the necessary permission and privilege to being able to see The First Kingdom, some stayed and were part of their community, others returned to their homes to tell the wonderful stories of the city, even though everything remained a simple myth. Of those who left the First Kingdom they shared their wisdom and knowledge in many towns, and others lived in their own way.

· But in case those travelers wanted to return home again, the First Kingdom city leaders created four temples that would give the exact location of the city. But only the descendants of First Ones who had a pure heart could enter. The four temples are located in the four directions of the compass, North, South, East and West, and are located where the four elements of the planet are most abundant, which would be fire, water, earth and wind. The first temple is to the North, and can only be found by following in the footsteps of an old First Ones lullaby. The creatures that contain Arcadia within them know of their location and some are guardians of those temples.

· Some First Ones created their own tribes and organizations and have devoted themselves to the study and use of magic. From there came the "age of the magicians", where at that time the beings who learned to dominate Arcadia spread throughout the planet exposing much of Arcadia. This even caused wars and domains in different parts of the planet just for the domain of Arcadia, it also began the almost total extermination of the magicians since several kingdoms and peoples considered them dangerous.

· In some places on the planet magic was considered dangerous and forbidden, but in other places they were considered the same, whether they were hidden or not. Ninjago City prohibits wizards and magic, but with a few exceptions and as long as users of the Arcadia contain permissions.

· But then came a dark time for the planet, where leaders, emperors and kings from different parts faced death sacrificing their peoples all for the domain of Arcadia, their wars almost ended the planet and all kinds of minerals were exploited.

· The King of Ninjago created a weapon based on Arcadian magic as well as through alchemy and science, it was so powerful that the magic inside it, as well as its minerals, were corrupted to the point of being dark magic after for the king to use the artifact on himself. This weapon almost ended life in his town and that of the other neighboring towns and kingdoms. The weapon was called "Seed" but after using the weapon and merging it with himself, the king lost his life after the power corrupted him and completely destroyed him after being carried away by his ambitions and dark desires. But two Firsts who were in the city of Ninjago managed to stop him after using their raw life magic to destroy both the king and his weapon before it reached a critical state in power. After his defeat, the city of Ninjago was rebuilt and a new era of peace and democracy began, and this peace also reached the entire planet.

· The mysterious First Ones who stopped the King were considered heroes, only that no one in the city knew who they were, even if knowing their names they used their sacrifices as a great example of courage for the city, and in each anniversary that the city celebrates they tell about the events of that day, they even created statues in his name, but as hooded and faceless figures, but making it known that they were a man and a woman. After those events the most powerful nobles created a council of leaders formed by the most important families of the city of Ninjago, thanks to those leaders of the city council, Ninjago was considered the most important city on the planet, since it is replenished with great technology and great resources from all over the planet. Its connections with other cities and kingdoms made it the most important progressive city in the world.

· But not everything was good for some inhabitants of the city, before the madness of the King of Ninjago there was an underground city based on mining and the extraction of valuable minerals, after the civil war the city fell into practice and became a anarchist place after the most dangerous criminals on the planet took possession of the city. The coup d'état left several inhabitants homeless and they took refuge in the underground or Underground City as it is mostly known, the laws of the city of Ninjago cannot be applied in that city since it ceased to be part of the City of Ninjago, they only establish a good free relationship by sending each other their resources, the relationship of the two cities is not very friendly but still, as long as they do not attack each other everything would be fine and another civil war would not start. The Underground City is mainly inhabited by fugitives, ferrosites, criminals, thieves, murderers, gangs, sects and clandestine organizations of any kind, as well as some poor and low-income people. The only jobs that are decent so far are mining, trade and construction, and it also depends on what services the workers are given, some of these jobs can ensure the security of a life in the city of Ninjago. Other wanted criminals from other kingdoms take refuge in the City so they can escape the laws of their own kingdoms and continue to do anything illegal. The underground city has become the main base of the most dangerous terrorists and organizations on the planet.

· Several of the inhabitants of the underground city hate the inhabitants of Ninjago, and several of their criminal networks are related to the corruption of some of the nobles of different kingdoms, as well as the nobles of Ninjago that includes even the military and servant forces from the city. And due to their numerous robberies and provoked attacks on the city of Ninjago, the council applied many reprimands to the underground city, several of its soldiers and police oppress the inhabitants of the Underground at times, and all with the purpose of applying order in both cities.

· The little magic left in Ninjago was used to craft numerous technologies and craft various defense methods for the city, this technology is also used by the underground city. Magic was almost forgotten after the events of the king's coup d'état, but it was not forgotten thanks to the history of the two First, the vuales were named as the "Two Wizards of Ninjago". But if they see someone practicing magic without permission, they will be taken to the City Council, as well as in the Underground, if the guards see something suspicious that is involved in magic, they do not hesitate to capture it and take it to the city of Ninjago.

· The Council is made up of the seven most important families of Ninjago, since they are in charge of providing resources for Ninjago. Several of them rebelled against the King and were the key to reestablishing the city of Ninjago.

· The underground is only made up of sects, organizations and gangs that are in charge of directing their territories or districts, some are very powerful and others are not, some are allies and others are enemies. Some areas and districts are run by rebels, who are members of the resistance who are in charge of destroying and sinking the corrupt noble families and defeating the most dangerous gangs and organizations of the Underground, several rebels maintain contacts and connections in Ninjago.

· The first temple is in the North, surrounded by water, hence its main element, and when it is entered it will show part of the direction to the First Kingdom and the direction for the second temple, and this is also shown in the other three temples.

· In the city of Ninjago there is not much religion or Gods, there are only important temples and Academies that are responsible for education throughout the city, the temples themselves focus on enforcing customs or laws for the entire city. The temples are the only ones that store Arcadia and it is highly revered by the leaders of those temples. Some of the temples are in charge of showing the path of good to people in their own way as well as when they show their teachings and beliefs. There are also dark temples, but most of them are located in the darkest places on the planet or in the underground of Ninjago. In the city there is the Temple of Light, where the most important figures of Ninjago reside, several leaders stay there from time to time, the Tower is the meeting place in Ninjago and the place where the new technologies of the city are created. The members of the Temple of Light are in charge of controlling the magicians, several of them are part of the temple, and they are in charge of solving the problems of magic in the city.