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"As Aizen had been engaging in early experiments on Shinigami/Hollow hybrids, which involved using an unknown device to cause spirits to transform into Hollows, he was responsible for turning his former captain and seven other Shinigami into Visored, though Aizen refused to go into any of those details." I have been looking at that and I have been wondering what Aizen used for that process. Some have said that it was a virus that started the hollowfication process, but when I read that, I knew that it was the