Do you like this idea? its for a fantasy book? its long question?

centaurions, there really primitive centaurs, half horse half human, except there 3/4s horse and only 1/4 human, they still have a horse-stile head, have a horse backside and everything, they have horse legs, there head is on a human-like chest with thick fur on it and the head is horse stile but with a human nose on the snout, and they have human ears, they are extremely huge, towering over a man on horse almost twice as tall and about five times as strong, and use iron swords mostly for weapons, rarely using bows or spears or axes to fight, and theyre magicians are extremely skilled, the strongest of their magicians stormed a city by himself, they live in deserts and use their height to see over the scraggly hills of dirt and rocks and sand that keep people on foot from seeing whats coming and ambush trading convoys, and only once meet the centaurs who evolved from them into the forest, and the meeting is brief, they think the centaurs copied them when they were moving through the desert to help the elves, the centaurians capture them and interrogate them, then let them move through the desert in trade for their tails. the centaurians make a big difference in a war between fauns and elves vs the wolves minotaurs boars and bears and oppose both sides, winning the war easily, they were officially the winners when they stormed the Stone Breath City, the capital of the minotaurs who were the strongest force before the centaurians came by and wiping out any minotaur they found along with theyre allies and the elves and fauns gathered outside the city for assault, is this a good idea?