Looking for a story that takes place at a time that humanity is in the process of discovering mystical powers for the first time. without any ancient knowledge/Ruins or anything similar
If you are okay with light bl, you can go for Stone age husband raising journal For BG , Gentle Beast and (it is beastial though)
I liked this one very much: https://www.webnovel.com/book/my-prehistoric-man-is-incredible_17778146205853005