Earth is now Arzatia

As you begin to shape the world to your whims and desires, you begin to find the first limitation upon your power thus far, albeit only a minor one. Making these alterations to reality requires a degree of mental concentration and energy. While it was almost imperceptible with a change as small as somebody's hair color, it's a whole different story when you're changing the history and laws that govern reality and the entirety of the known world. As such, early on you create an impenetrable orb, standing as some sort of sub-dimension that's inaccessible by anybody beyond yourself. It's here that you rest to recharge your mental power between rounds of changes. Overall, the whole process takes a week before you're satisfied with this new world you've made.

Humans are no longer the only humanoid sentient life forms. The world is now a fantasy world, featuring things such as nature spirits, elves, dwarfs, and animal people. While tense relationships keep most of these different beings from living with each other, there are cities where such beings level in...well, as close to harmony as it gets in this world.

The main races-Human, Elf, Dwarf, Dark Elf, Beast Person, Merfolk, and Nature spirit-are collectively referred to as "the races". In spite of being different, each race does use the same common tongue, although several of the races have their own unique language as well. The races also all use the same currency system-a fantasy one you made for simplicity and kicks. 100 Bronze coins = 1 Silver coin, 100 Silver coins = 1 Gold coin, 100 Gold = 1 Platinum, 100 Platinum - 1 Dark Gold.

Earth, now under the name Arzatia, has been overrun by monsters, beginning more than 2000 years ago. Although it was slow at first, now between 80-90% of the known world is ruled by monsters, as well as those that govern monsters, the demons. You've given humanity and the other races a defense against this-the mark of Kellis. Kellis, the god that the races worship, doesn't actually exist. The gifts attributed to having been given by Kellis are what you gave humanity when you feel generous. The mark has several sub-marks, known as classes, given at age 12, as well as a number between 1 and 1000, representing how powerful the person is. The number increases based on the number and power of monsters beaten by an individual. So for example, somebody might have the Mark of Kellis Archer-220. Thus, it would be a Mark of Kellis of the Archer class, meaning that the person should be wielding a bow and arrow, and of the 220th level.

In a world so dangerous, any organized government is too occupied with monsters to be able to enforce many laws. As such, especially in bigger cities, crime and corruption tend to run rampant, and thus the strong and resourceful survive and rise to power, while the weak fall beneath them, subjugated and oppressed.

This information is what is typically known to the populace of this world. You, however, as the one who sculpted the world know plenty more. For example, while you know that the Mark of Kellis can be brought up to the level of 1000, such has never been seen. In the entirety of history, the highest that the world has ever seen is 704, a female Elf with the Forest Guardian class, a class that specialized in the manipulation of plants and nature to support their melee combat skills. Even elite adventurers and warriors usually only can reach the upper 90s. The average level for such jobs is 30-45. Beyond level 100 is a hero, and by the time a person reaches level 300, they'd be classified as a legend.

You also know that demons have infinite lifespans. They also can't naturally reproduce on their own, as their race is entirely female and humanoid. Many higher class monsters, such as dragons or behemoths, can also transform to a humanoid form. Such monsters are almost considered to be myths considering how rarely a person sees one though. After all, the only reason the races are alive is because the demons only had the weakest of monsters at the front lines and around most settlements. They seemed to enjoy toying and playing with the fate of the races.

You also know, as a little fun fact, that all of the land that the races remain in control of exist in what used to be Europe.

With a world that you can play in and do with as you please now crafted, you go to sleep. When you wake up, you summon a mirror and begin to make some final changes. Those being the changes you make to yourself, so as to create the form that you want to use to enjoy the world of Arzatia.