What was Zangetsu's Task for Ichigo to get Bankai?
It is mentioned that this method only worked once before. Hence, it is a tested but not used method. As for the training, the user was supposed to fight the personification of the Zanpakto, or Zangetsu for Ichigo, since for the Bankai one needs the 'materialization and submission of the Soul Cutter'.



It was mentioned beforehand that the sword around represent the weakness in his heart and with each broken sword he will get stronger. However, he has to survive the complete training first.