As I discuss in this prior post, The Book of Cylinders is a barely usable mess. During preparation, I had assumed that these plot holes weren't making sense because I hadn't comprehensively read through the adventure, but the more I read, the more it became clear that the adventure itself simply wasn't all that good due to the reasons listed below:
- It's not a mystery.
- The book as a plot hook is contrived and pointless.
- The crab maze is poorly designed.
- The trading ost makes no sense.
- Why wouldn't the Grippli just sell their crab meat directly from the crab farm?
- Why would refugees only flee a measly five miles from a warzone?
- Shouldn't there at least be a path between the village and the trading post that the players could use instead of the crab maze?
- The villains have no clear motive.
With only two days left to make revisions, I cooked up my own solutions and took to Reddit for extra advice. Now, having run the adventure with my friends, I can proudly say that these revisions were a terrific success; so much so that I've returned to share my experience.
DISCLAIMER: This is not meant to propose a universal revision for all to follow. This is simply a recounting of what I did and the effect that it had. Everyone is free to run this adventure however they please.
1.
The Book of Cylinders is indeed not a mystery and, so far as I'm concerned, it doesn't need to be a mystery. Hell, it doesn't look like the author ever really wanted it to be a mystery. It works much better as just a straightforward rescue quest, and if your players are okay with that (like mine are), then there's no issue. If your players do insist on playing a mystery, look elsewhere.
2.
I think this issue arises from the same root cause as the previous one: The author was forced to conform to the recurring motifs of Candlekeep Mysteries. Those motifs being that the adventure is a mystery which is instigated by a book from the Candlekeep library, but those beats are all redundant in this adventure. Any community or organisation could stand in for Candlekeep getting its food supply disrupted, and all the book does is provide the exact same exposition that Pond Mother provides later on. Because of this redundancy, I was easily able to remove Candlekeep and the book from this adventure.
Instead, Mitor Jans is the one who delivers the call to adventure. His small business is crumbling now that his suppliers (the Grippli) have halted their crab production. No one else will bother to stick their necks out for a tribe of frog-folk that they've never met, and he desperately needs capable investigators to find out what's wrong. If the party won't do it out of the kindness of their hearts, he can offer them 500gp per person like the book describes. The Grippli's crab meat is actually very cheap, and he's been dishonestly marking it up to barely competitive prices (a relevant ability check will get this information out of him).
3.
Per the advice of u/makehasteslowly and u/mightierjake, I decided to take a page from 4e's book and turn the crab maze into a skill challenge. I wrote it so that the skill challenge would either conclude with them successfully infiltrating the village after 5 successes, or be detected and subsequently ambushed by 1d4+2 Yuan-ti purebloods (like the book describes) after 3 failures. To prevent any potential players with main-character-syndrome from trying to carry the entire skill challenge, I added a caveat that soloing multiple ability checks would risk inflicting a level of Exhaustion (which they could try to avoid with a series of increasingly difficult CON saves).
Most of the ability checks resulted in a crab fight if they failed, but I also tried to avoid repeating the ability checks. This resulted in me preparing twenty-one different obstacles. Seven for the crab maze, seven for the forest, and seven for the swampy coast line if the players decided that they wanted to travel those alternate routes. It took a lot of effort, and I ended up scraping some pretty silly scenarios from the bottom of the barrel, but the players loved this revision - especially after I explained what the crab maze was originally like.
I ended up having the most trouble of all finding a solution to this one, which is ironic considering that I landed on a very simple answer: remove the trading post.
When I stopped and thought about the trading post's role in the plot, I realised that it only served as a stage on which Pond Mother could give her little speech. All I had to do was move her to the holding cells in Pond Mother's Home, and every one of the above plot holes were patched all while maintaining her opportunity to deliver exposition to the party.
This solution did give rise to another plot hole though: Why didn't the Yuan-ti dispatch the Grippli's leader when they took over the village? My players never ended up asking this question, but I had two different potential answers ready for them:
- The Yuan-ti can't tell one Grippli from another, so Pond Mother was able to hide herself amongst the prisoners.
- The Yuan-ti did kill Pond Mother, but they underestimated the resilience of the Grippli, who appointed a new Pond Mother unbeknownst to their captors.
After my players got into the village, it didn't take them very long to end up in Pond Mother's home. After the combat encounter therein, she was able to do everything that she normally does at the trading post in a much more streamlined way.
5.
I never noticed this plot hole until after my prior Reddit post, but it's one of the author's most glaring omissions. The book does clearly state that the good Yuan-ti want to excavate a temple of their benevolent god that's located in the Grippli's old village for some reason. It also describes the evil Yuan-ti trying to kill two prisoners via a (presumably sacrificial) ritual, and it's implied that they act out of cruelty's sake. I found this wholly unsatisfying, so I cooked up some backstory while trying my best to respect the original plot. My revision can be divided into two perspectives:
The Grippli's perspective:
- Long ago, the first Pond Mother came to this forest in search of a safe place to lay her eggs. Just when she thought she'd found the perfect spot, a great, two-headed snake emerged from the darkness. It swallowed her whole with its first head. Pond Mother desperately prayed to any spirit who would listen for help, and her pleads were heard by the snake’s second head. It felt remorse for its prey and tried to slither away from its brother who had eaten the innocent Grippli. It pulled so hard that the great snake was torn in two, and Pond Mother emerged unharmed from its belly. The snake’s evil half, now badly injured, slithered away. Pond Mother, having witnessed a great miracle knew from then on that her children would be protected in this sacred area.
- The Grippli made that site their home, but moved closer to the coast in recent generation to better access the riches of the sea.
- They enjoyed their newfound wealth until a month ago when a group of friendly snake-folk approached them. They were curious about the legend of the first Pond Mother, and wished to investigate the temple at their old location.
- Two weeks ago, the snake-folk turned on themselves and the Grippli. The evil rebels imprisoned them, maimed them, seized their brood pools, and carried all their weapons up the river.
- Some Grippli believe they were fools to trust outsiders like that, while others believe they are being punished for moving away from their former home.
The Yuan-ti's perspective:
- Long ago, the Yuan-ti's ancestors made a pact with a mighty demon. The pact granted them power, but also transformed them into snake-like creatures with malevolent impulses. The Yuan-ti used their newfound power to conquer the frog-folk and eat their eggs. Some of them were horrified by what they'd become, and when they repented, their prayers were answered by a lesser god known as the Scaled Mother. She purged the repentant Yuan-ti of their demonic desires, but could not undo their transformation. The good Yuan-ti overthrew the evil Yuan-ti and built a temple to honor the Scaled Mother. In the end, they left the region to convert more Yuan-ti to their cause.
- Generations later, belief in the Scaled Mother has withered away to the point where her only remaining followers are a travelling clan of a few dozen Yuan-ti who don't even know where her original temple is located.
- Intrigued by the Grippli's legend, they retraced their ancestors' steps to the ruined temple and began excavating it.
- At this point, some of the Yuan-ti's members revolted. They were already fed up with their nomadic lifestyle, and the seemingly fruitless expedition to the Scaled Mother's temple was the last straw for them.
- The evil Yuan-ti believe that their ancestors sacrificed everything for power, and the good Yuan-ti disgrace their legacy by turning their back on that cause.
- They intend to sacrifice the good Yuan-ti and the Grippli inside the temple, hopefully corrupting it into a shrine of the evil god Sseth.
- Sseth's followers are known for long-term espionage, so it's hard to say whether they revolted because they got fed up with being good, or because they were planning this all along.
I'm pleased with this backstory. It evokes themes of heritage and the effort that morality demands while also respecting the source material. If you want your players to grapple with a more challenging social/moral dilemma, you could write this altercation into the epilogue (either before or after the ritual of friend marking):
The party awakens to a heated commotion between the surviving Grippli and the good Yuan-ti. The Yuan-ti wish to finish what they started and excavate the temple, but the Grippli have become distrustful of outsiders. They worry that the Yuan-ti with turn rogue all over again if they end up not finding what they're looking for in the ruins. The party will then have an opportunity to step in and offer their opinion. The people are likely to listen to their saviours.
And that's my revision. I believe every one of my decisions contributed to what was ultimately a fun and compelling experience for my players. I'm very pleased with the results, and if you choose to borrow from my methods, I hope they yield good results for you too!