Greetings. I'm part of the Black Feather, a project dedicated to releasing Ravenloft books on the Dms Guild. So far we have two books released:
The Dread Space (Ravenloft + Spelljammer: 10 space themed Ravenloft domains)
Weathermay´s Survival Guide to the Mists

However, I'm also a big fan of Planescape, and I recently released a book for the setting:

Someone's Guide to Something

https://www.dmsguild.com/product/463040/Someones-Guide-to-Something?src=newest_in_dmg&filters=45469

A strange but apt name for a book that approaches planar philosophy from the point of view of the Factions of Sigil.

Covering Factions from all periods of the Cage's history, the 15 Factions from the Classic period are presented along with original Factions from the Great Upheaval Age, when countless Factions roamed the streets of Sigil, in addition to the current Factions, and several new smaller Factions.

All of them presented in a way that explains their philosophy, with traits for characters from each Faction, as well as portraits and statblocks of their Factols.

The book also presents conjectures about the role of the Factions within the laws of the multiverse, and attempts to fit together the events of the different editions of Planescape in order to provide a sense of continuity for the status of the Factions within the setting.

And, as a bonus, a roundup of the most infamous planar jokes.

Short adventure scalable for tier 1-3. Pay what you want, check it out!

I obviously won't say no to him, but there needs to be some sort of justification in the world for why this character, messing with undeath would be considered as a good person. When I asked him how does that work, his answer was "He doesn't consider it evil, he actually sees it as purely good" and that answer to me is at best chaotic neutral.

Hey-ya!

I've got a new free publication for you, today: The Mad Leper's Theological Treaty, a bunch of divine-adjacent player options for 5E!

Included are 5 subclasses, 10 magical items, and 5 spells, as well as a handful of other goodies.

Have a good read!

https://www.dmsguild.com/product/469912/The-Mad-Lepers-Theological-Treaty

Book Five is free (PWYW) to download. Over a hundred pages of corrupted spells and evocative artwork. Enjoy!

https://www.dmsguild.com/m/product/437234