Hello, there is this original novel I read some years ago possibly on the royal road (don't remember) but the story goes like this. The MC is reborn (? don't remember properly but based on what I remember, the MC does know some things about modern era, but forgot about who he was or names of people) as a lizardman, to the clan head (who has blood of hydra). He is the 5th son (I believe). Also the MC and lizardmen have the ability to evolve. MC also fell in love with a lizardwoman who is white and a saintess of tribe (they are of same age. He fell in love with her in coming of age ceremony where he was given name by his father). Based on what I remember the title of novel was "Empire of" something. I am not able to remember, at foirst I thought it was Empire of Marsh or Empire of Swamp but I didnt find any novels of that name. If anyone can tell me then your help will be appreciated.