After the Yuan-ti took over Jalal, they were no longer confined to the jungles and swamps. Their eggs were able to be kept safe, guarded by the Chimeras they had trained to do so. They lived longer, bred more, and swarmed the earth. They became the dominant species, and under Nafaru, were not the tribal people the Races of Light had come to know.
Raja Nafaru forced unions between orcs, gnolls, goblins, and other monsters - something which had never been done before. Maharani Amosha, his queen, sorceress and confident, summoned cambions and other demons to bolster his forces. They were unstoppable when they worked together.
However, having such a large army does have its draw backs. There is unrest in the ranks; the humanoids they kept for slaves are unable to keep up with their demand for food, and many of the monsters threaten rebellion if they are chosen to work. They cannot deny the chaotic order that Nafaru has brought to them, but many have leaders of their own who wish to rule as well. Still others have found a soft spot of the races who've survived the persecution, knowing that the current state is no better than it was before, simply the reverse.
Do you clamor for King Nafaru's crown? Is it for personal gain or because you think that Nevae needs a new World Ruler?
Or perhaps you wish to bring balance and peace?
Maybe you have a god that wishes to vanquish the evil brought to the world, and you're duty is to act on their behalf?
Whatever your drive, you will find Nevae a harsh world with unexpected people. Be careful, and know that watching your back may not be enough to keep you alive.