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I just posted an article on soulfaring to the City of Ten Thousand Daggers site. This is mostly a slightly revised version of the soulfaring section of Tales from the Lusty Minotaur without the rules, but there are a few new details. The patron-only “Secrets” section (click the button at the bottom of the page between the footer and the comments section) provides brief descriptions of the other planes of existence. If you’re a patron, sign up for a (free) World Anvil account and send me your user name so you can see the secret content.
View at World Anvil (required to see secret content)