A magical world.
It's a world from the Middle Ages, around the 15th century. There are many races and creatures: Lizardmen, Beastmen, Demons, Dwarves, Succubi, Common Humans, Draconites, Elves, Half-Elves, and a host of others. The flora and fauna can also be listed endlessly, but they are all different, and with different characters.
There are only 3 kingdoms in this world: Abadon is a kingdom of the poor and with creatures without much morality. It's in the north. This kingdom survives on the fact that it provides everyone who needs mercenaries, of course for a fee. Another kingdom is Miseria, the kingdom of the higher ranks and nobles. It's in the south. But it is not without poor people who try to hide in the slums. This kingdom is kept on food and handicrafts, as well as the need to sell their fruits for a certain contribution to the kingdom's treasury. And the last kingdom is Erebus- the kingdom is located between the two previous kingdoms, and in order not to provoke conflict, it opened its gates to all comers. This kingdom is something like a huge market, as it is flocked by the highest ranks with aristocrats, as well as refugees and unrecognized races of creatures.
The entire world is held together by magic, and it is eagerly studied and has reached near-complete mastery. Otherwise, aside from magic, and the multitude of races and creatures, it's a normal world circa the 15th century.
Of course worlds are never perfect, and so somewhere far to the west, there are settlements of the Dark Ones. The Dark Ones are all races and creatures that have joined the forces of Hell and Darkness. They also have their own rules and precepts. And what would not let this kingdom of Hell to the neutral kingdoms, the three kings decided to create an alliance, although there is some animosity between the kings themselves.