Thread:Anon421/@comment-31762568-20190816092239/@comment-31479589-20190816174731

To me it seems like the portal just warped reality, as it has the capability of creating worlds. What happened probably is the portal switched the judgement that was initially meant for humanity to the Underworld. That means Volcano and co. are gone, though they can be reborn again. And that's the Enter part. What happened with the Step Back option is obviously different and that fact in itself doesn't support the theory of Shadow becoming godly Eternal.

Good chance that everything in the Underworld will never be referenced at all in SF3, let alone having any impact to the plot...