Rimuru achieved everything which was possible but there is one regret he has in his mind even after the 12 years of the great war that he cant save his 'Destined One' So after 12 year he Decided to clear this regret but he don't want to change the whole timeline by directly interfering so he decided to live the whole life again after being reincarnated but this time he has every skill from the moment he reincarnated. Note: I changed rimuru personality a little bit after ch4 , I made him act like evil sometimes. The story also started to change after ch4, You would only be spoiled the events and character names of ln. Thanks @VytsuDesigns for the cover.