This story has been on my mind a lot lately I read it years ago and the only things I remember from that story are 1. Die and reborn again 2. Mc will be born only after the same time has passed as he was Alive 3. His reborn powers are tied to a place where there is a spirit and he can only access this place because of his soul 4. The spirit tells the mc that strong beings have hunted the previous owner of that power to make things from their soul and souls with that ability are a powerful tonic 5. On his 4th or 5th life he trains under an alchemist and leter was killed by the alchemist enemy 6 talent are measured in colors and after that there is an ocean level talent.