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So if Kartana and Nihilego have their own Ultra Spaces, I guess that makes them like Daedric Princes with their own planes of Oblivion
Ultra Wormholes can work like Oblivion gates where they pop up all over the region in random or set spots and take us to the new areas, same way Marine Cave and Terra Cave work in Emerald
Celesteela's world can be a Bamboo Forest that's made of Metal, Buzzwole can be a giant infinite Beehive/honeycomb, Guzzlords can be a black hole with the remains of the mountains and cities he's devoured