Mine would be a world of violence, blood, and warfare. The sky would be dark red with black clouds and oceans of blood and lava would cover about 70% of the planet. Many kingdoms will exist, all simultaneously at war with each other. Alliances are either rare or short lived. Firestorms would rage across the barren wastelands destroying the remains of the dead and defeated. Nightmarish hell beasts roam the lands killing anyone stupid enough to travel alone or in small groups. These creatures are both predators and prey. They are the main food source for the intelligent inhabitants. The temperature at most is 40°F. I am ruler of the strongest kingdom. I sit on my obsidian throne waiting to be defeated, waiting to be killed. Once that happens I would become a God and remake the universe... again. That is my current dream world. Oh and we only have advanced technologically to around medieval Europe like technology. People also have babies quicker, have more of them than an average human and they mature quicker.