This continent is the only one that contains life... beyond its many islands, the continent of Green Leaf provides the conditions for a race as weak as humans to thrive. It was difficult in the beginning, humans learn magic from other creatures, most of whom saw them more as a nuisance than someone to educate....relying on poor mechanical inventions that paled in comparison to the multiple magical gadgets, surviving or being slaves to those who had the power, until the wizards were born, no one knows where they came from, even today people do not know if the ancestors were partners or sex slaves of some of the most privileged races, the fact is that with the passing of the centuries, magic permeated human society.
Normally this would be of no consequence, but most of the magical races found their abilities slowly diminishing, spells that would normally tear down mountains becoming mere substitutes for dynamite, chaos threatening if the tenuous balance between the races was disrupted.
 It is not yet known whether the humans were special or just happened to be, but the cities that had a human wizard did not lose the use of their machinery, which in their time was powered by magical runes that stored and harnessed the power of the wizards of all races. As the rumor spread, the human population centers were flooded by all civilisations, they were no longer a minor race, they were the salvation of civilisation in Green Leaf.
What came to be known as the magic field was nothing more than the area of influence created by the magic of the human wizard, its radius depended on the power of the user, the most powerful built huge cities around them with a radius of more than 200km, the apprentices and the untalented had villages of 1 km along the roads that connected the cities.
 The ancient archmages of all the other races rebelled, they blamed the human wizards for the loss of their power, the battle was bloody, a slaughter to use a better word, the elven wizards, dwarves, even the elementals with their diminished abilities were formidable foes against beings who were barely aware of the power they possessed, To protect themselves they built towers in the center of each city, but they did not fool themselves, they knew that their days were numbered, they would never learn enough to face races with millennia of experience, it was then that civilisation united.
The normal humans saw their new way of life threatened; the other races, accustomed to their status of living with all the devices powered by the magical powers of those being attacked, chose to turn against their own rather than return to the crude tools of their industrial evolution.
 Seeing that their people did not support them, the high commanders of magic called off the attack, angrily warned the world that they were not worthy of them, and in an act of wounded pride and rage, threw all their magical items, all the scrolls containing powerful and now useless spells to them, into the center of the continent, using up most of what little power they had left and thus ending the war.
The normal races saw their new way of life threatened; the other races, accustomed to their way of life with all the devices powered by the magical powers of those being attacked, chose to turn against their own rather than return to the crude tools of their industrial revolution.
 Seeing that their people did not support them, the high commanders of magic called off the attack, angrily warned the world that they were not worthy of them, and in an act of wounded pride and rage, threw all their magical items, all the scrolls containing powerful and now useless spells to them, into the center of the continent, using up most of what little power they had left and thus ending the war.
None of the inhabitants, dared to enter the interior of the continent, even when the wizards were powerful, the place they chose was a basin larger than all the coastal cities put together, the first 500km were forest, but from there followed barren plains, and then treacherous mountain ranges, that just to speak of the dangers of the terrain made it difficult, if we add the large number of wild beasts and magical creatures it became a suicide to enter or leave.
 On the other hand, the human wizards never left their towers, some fearing possible revenge from the once powerful races, but most fearing to be captured and enslaved by their own race in its hunger for power.
The population grew, prospered, each city overlooking the sea, there were battles between them, but since they had no magic for conflicts outside the cities, the amount of damage that could be done was minimal, since the population could not use magic other than that contained in the artifacts that survived the war and the few harmless inventions of the human wizards, they turned their eyes back to the industry invented by the despised beings.
 Perfected by the dwarves, the dull steam-powered machinery of the humans developed in astonishing ways, navigation, flight, even transportation became faster, and the civilization that was on the verge of extinction grew again.