NO SPOILERS
I played Voice in the Void with my Oracle of Groetus in a live tabletop game. He got killed and the rest of the party sensibly ran away! In other words, it's a tough scenario. I will say, however, that it contains an excellent backstory and makes great use of setting lore. It's also a scenario that continues and furthers the excellent Pathfinder Society plot thread involving the Blakros Museum. I'd recommend people play it, but with PCs leaning into the combat-capable side of things.
SPOILERS
The scenario starts with a briefing by Venture-Captrain Adril Hestram at the Grand Lodge in Absalom. It seems the curator of the Blakros Museum, Nigel Aldain, has reported that Imrizade Blakros (daughter of the patron family) disappeared while doing work in the museum's basement. Since several watchmen sent to find her have also disappeared, it seems like a job for Pathfinders to find her! Hestram explains that the Society is willing to take the job because Imrizade's a successful fortune-hunter who had just returned from Osirion carrying a mysterious artifact: an odd metal cylinder covered in hieroglyphs. So, the field agents are being sent to find Imrizade not out of the goodness of the PFS' heart, but so they can either get the artifact or some information about it. All in all, a solid story hook.
After the briefing, the PCs presumably travel to the museum, where they're met by Nigel Aldain. He shows them the secret ramp down into the basement, and that's where the rest of the scenario takes place. So, in one sense, this is a classic dungeon crawl. But as I said above, there's a ton of careful setting lore, atmosphere, and backstory integrated into each room and encounter to make for a compelling adventure (i.e., this is *not* a "one orc stands in a 10x10 room guarding a treasure chest" style of dungeon crawl). Dangers include caryatid columns, animated dinosaur skeletons, oozes, fungal molds, and (in their first Pathfinder appearance), cerebric fungi. It all builds up to a really cool finale, where the PCs discover Imrizade standing in front of the Gate of Beyond, a portal to the Dark Tapestry, with fleshy fungoid umbilicals attaching the Gate to her body!
The backstory lore is extensive and interesting. Before being turned into a museum, the building was originally the manor of Ralzeros the Overwatched, a mad astrologer and wizard obsessed with the distant worlds beyond Golarion's skies, who built on the site because he had discovered the Gate of Beyond buried there. Thousands of years later, Imrizade Blakros had discovered the gate while playing in the basement archives as a child, and later ("recently") as an adult adventurer, discovered a strange metal cylinder in Osirion that turned out to contain the ghostly consciousness of an aberrant sorcerer named Kubburum Ishmedagan that took over Imrizade's body. Returning to the museum, the possessed Imrizade is working to reactivate the Gate of Beyond and open a portal to the Dark Tapestry--thus attracting all sorts of bizarre and dangerous creatures from Aucturn and beyond. For those keeping track, we also get a reference to the Aucurn Enigma!
My description and summary probably hasn't done the scenario justice, but those interested in the lore of Golarion and the excellent interweaving of Blakros family drama into PFS scenarios should definitely experience Voice in the Void. It may kill you, but that's what Prestige Points are for!


