Sequels, Prequels, Sidequels, and More (WoBS/Zeitgeist Spoilers)

[CubeB]

Hello! I'm a big fan of the EN Publishing adventure paths. I finished running an amazing Zeitgeist campaign last year and am currently in the middle of a War of the Burning Sky campaign, which is quite a ways out from completion.

Lately, I've been running games in Fabula Ultima. As a result, I've mostly been using the amazing settings and adventures as a leaping-off point, rather than strictly following the story. My party loves going off the rails and spiraling off into emergent stories, and it's led to some pretty memorable moments. Examples include...

• The party Artificer using his connection with the Voice of Rot to whisk Borne away into the Dreaming, unwittingly allowing the Voice of Rot to possess the Colossus and deliberately use it to disrupt the Ob's ritual.
• Nicodemus dying several books early (which worked because the Voice of Rot was in position to sabotage the ritual and wreak havoc in the Great Eclipse phase).
• The descendant of the orcish hero who created the seals on Axis Isle sacrificing himself to become a new sun.
• Haddin Ja using the last of his life essence to paint a tulpa of his dead brother, because someone secretly used Fabula Ultima's meta currency to modify things so that something good would come out of that.
• The party having to rescue said tulpa from Madness in a Clair Obscur inspired sidequest, because the monk gave him a Tomato in the Mirror moment.

Ragesia, Lanjyr, and the rest of Amswyr have sort of been molded into my own take on the setting, and I'd love to keep playing in them, but I also like having rails to lean back on when mental health gets in the way of planning. It gives me a foundation to build on, and a direction to nudge things. I always know what the villains want, what they're doing, and how they're interacting.

So I'm looking for suggestions on things I could hack for potential prequels, sequels, or uh... sidequels.

I'm looking for an adventure with similarly memorable villains I could turn into recurring foes, and plenty of space for players to create emerging stories while still having a narrative throughline. Zeitgeist had the mystery of the Obscurati Conspiracy. War of the Burning Sky has the threat of the Ragesians. Characters will be modifying the setting regardless, but I like having plot points to follow.

1. I own Adventures in Zeitgeist and have that lore information; I'd just love a loose framework I could map it onto.
2. I've already run Bonds of Forced Faith (as an in-universe flashback), Crypta Hereticarum (as part of Zeitgeist), and Death of the Author (as a one shot, twice).
3. My players are largely familiar with the Pathfinder APs (ESPECIALLY KINGMAKER), though one could work.

Some things I was looking at:

• A plane(t) hopping campaign set in the post Great Eclipse timeline. I was looking at Legendary Planet, but the whole Lost in Space thing disconnects it from the setting I've grown attached to. Plus there's no room Pemberton Starships. Path of the Planebreaker is a possiiblity too.
• A story that follows up on the threat of the Golden Legion somehow.
• Potentially taking a fitting Pathfinder (or Starfinder) AP, filing the numbers off, and plopping it in.
• I own Memories of Holdenshire and considered it, but haven't fully read it yet.

I was wondering what recommendations people had for campaigns or sets of adventures that scratch a similar narrative itch. System doesn't matter, since I'd just be using them as a framework.