The goal of the experiments where to create the "ultimate Shinigami". It was clear that a Shinigami grew in strength the more they opened up to and familiarized themselves with their zanpakutō partner. Using Modified Soul technology, seven individuals where created, each of which could use not only one, but two zanpakutō. Bansui was in charge of the observations of the subjects, as well as the experimentation carried out on zanpakutō spirits, as outlined in his research findings pertaining to the project; which Jinta Kanō recovered during the foray into Soul Society.