A new world is a new opportunity

In a world where humans are on the verge of extinction, the last kingdom of humans is under threat from different races from elves, demihumans, angels, dwarfs, fairies and demons who consider humans to be the weakest. Our protagonist is an old man who dedicated his life to inventing objects that helped create a better world, but he was never recognized and was considered a mad scientist until he died, reincarnating as the second son of the Duke of Edevan. He is Thoryan Von Edevan , that having abandoned his family, for his dream in his previous world, he will fight to protect his family in this world, at the same time, he will try to avoid the imminent destruction of humanity.