In IT, The Macroverse is described as being the home for Maturin and It, as well as where Maturin vomited out the mainstream universe. The Macroverse is also most likely the resting place for Maturin, who It stated as "having choked on a universe or two". It is unknown who or what created The Macroverse, but it was more than likely Gan who himself is the creator of the multiverse and the embodiment of The Dark Tower.
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