Naadam would make a great pvp mode, and It would consist of random small teams competing together to be the strongest in the steppe, and an extra solo mode might also be possible to offer an enhanced difficulty. Now how would that work in the lore exactly? The Naadam is sacred, and only happens once a year. Well, why not train for it? Each match could be described as a training match for the sacred ceremony, and not the ceremony itself. The steppe warriors obviously don't just go marching in, they have to practice for it. I see no reason why there wouldn't be training exercises. It could also open the possibility for new rewards, including titles, and glamour.