As you're first getting oriented to the massive world of Assassin's Creed Shadows, it isn't immediately evident what features such as Kofun or Kuji-Kiri are and what purpose they serve in the game. Kuji-Kiri are unique in that you'll learn about them first through Naoe's personal quest, but they are also part of a larger interactive location system that awards Knowledge Points for completing specific tasks. Naoe, however, needs to visit at least four Kuji-Kiri meditation spots to fully tap into her memories and reveal more about her past.