With one of the prerequisites of Phase Four requiring the awakening of his Zanpakutou Spirit, Vahn found himself riding on the back of Zhuque in her Vermillion Bird transformation. Thirty-seven years was a long time, even for a normal person, so Vahn had made startling progress in his mastery over [Rakshasa Body] since his evolution. In the past, he had always relied on linking the reserves of every single one of his vessels, putting a heavy strain on his body whenever he wanted to manifest one of the Divine Beasts. After discussing the matter with Da Vinci, however, Vahn pioneered a method of basically turning his vessels into storage containers, rather than batteries and receivers.