Planescape: Adventures in the Multiverse book details
It looks like this will also follow the template of the Spelljammer books, with some player options, setting information, and DM facing content (adventure & creature statblocks).
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An adventure for levels 3-10 and 17.
This right there? This is why nobody plays high-level games.
Structuring an adventure with skipping Tier 3 entirely sounds interesting, NGL. It's not something we have seen before.
It's a very strange approach.