NOught, I recommend adding more to the game, like expanding the map, and adding at least 2 more factions, like the green skins, serving as evil mercs in evil taverns. and the holy order, like Paladins and other holy warriors, and most important for me, adding magicians, like real once that cancer at fireballs using mana and stuff like that, though it will take long, you can, if you may try magic, get some files from magic world, cause Necromancers that don't summon undead, or even use fire balls and dark magic in battle, are more like fanatics, who serve as the pawns, no matter what rank. I don't get one thing in your game, infinity stone kills every human right? Well you should change it cause I'm no human, for hundreds of days I was a werewolf, but it really kill my guy when it breaks, which is stupid cause I'm a werewolf. And also add new werewolf/vampire troops, like a werewolf that has high agility, and low strength, running on all fours, or vampire duke/count that can bite enemies in battle, turning them to his side. And vampire bats to. You should also add a god as a marshal of each faction, after zendar becomes necropolis, like Thor to Nords, Zeus to Swadia, Poseidon to Khergits, Odin to Vaegers, and Athens to Rhodoks. Thus, more of a chalenge for the character when he masters the arts of evil, instead of Beating everyone without dropping a sweat.
More to the green skins, goblins ussually rob, so giving the, knives, and masks will make it better, orcs, trolls, and ogres might be harder because they are very high, and making wolves or worgs as Orc mounts. Also, make the towns dirtier cause they're not very caring, so villages should be very poor, and make there land closer to mountains for them to hide. Alas, if you do try that.