Haman knew that his life would not be good the moment he could even think. Ever since he could realize things, he knew that in some sense, he was dealt the short end of the stick,
Be it being kidnapped and enslaved by the age of 5, or having the false hope of being saved by the age of 17 just for the original slaver group to be overpowered by an even bigger, even more ruthless enslavement camp, Haman knew that he was extremely unlucky or so he thought.
See, in this world, the land of Nyxestria, the darkest lands, some percentage of 'people' have birth defects, but in this world having a birth defect has a different meaning.
On normal earth, having a birth defect usually mean your going to be along for the rest of your life due to your figure, or you can't use your hands or feet in any normal way. in Nyxestria, those unfortunate circumstances may be the case, but most of the time a a birth defect comes with a mental or physical ability thats better than the general population.
Some people might be able to withstand extreme temperatures, while other can manipulate wine or some other alcohol with a simple thought, but for Haman, he was not so fortunate.
Haman had the ability to dream dreams of random scenarios that have a random chance of happening, which in the darkest lands, is not very useful, one month he dreamt the same dream of a wandering swordsman killing everybody in the enslavement camp, but after nothing happened, he was sent to the punishment room for a year with little food and water almost dying everyday.
As you can see, compared to other abilities, he ability is one of the worst abilities there are, but due to inconspicuous event, Haman will be know as the darkest emperor, all because of another kidnapper, and another dream.