 |
| (c) logo by (r/Rhineglade) at https://www.deviantart.com/rhineglade |
Session Preparation: Surviving the Underdark Slog
This session marks our official entry into Book 2: Perils of the Underdark. As many veteran DMs know, this section of the campaign is notoriously infamous for becoming a slow, punishing "slog" where many campaigns quietly fall apart. Because of this, my primary focus for this post is on campaign preparation and pacing.
Cover of book 2
Even though I have read through the entire campaign before, it is impossible to hold every minor detail, room layout, and branching encounter in my head at once. Heavy re-reading is a absolute necessity as part of my prep work. In Book 2, my main objective is keeping the campaign alive and maintaining a strong narrative drive so the characters actually want to push deeper into the darkness. While the players are already motivated to keep going, my job is to sustain that interest by injecting memorable events, meaningful choices, and strong pacing.
As I always do, I watch RpgLoremasters video on book 2 to get a good overview of the whole book.
To get a overview of the encounters and storyline I used the map given on page 65 of book 2. I didnt find this map very helpful so I searched the internet and found u/MurderBeast on Reddits Night below strategic underdark map. This map is very helpful to understand travel distance, random encounters, dangers and encounter points.
 |
| Encounter and travel map of book 2 made by MurderBeast (c) |
I don't use the Night below box set when I run the campaign, but a PoD version. so I made a Underdark hazards: an explorer's guide one pager with the help of AI. This really makes it easier to find information of the hazards of the underdark travel.
 |
| AI generated one pager |
Expanding Book 2’s Interconnected Storylines
Book 2 offers several interwoven storylines that can easily feel disconnected if they aren't tied together properly. Here is how I am approaching the key arcs and encounters:
The Svirfneblin Alliance: The Deep Gnome story arc can technically end once the party neutralizes the trolls, but there is so much more potential here. I plan to position the gnomes as vital allies for the assault on the City of the Glass Pool at the very end of Book 2. They might not serve as frontline combatants, but they are uniquely positioned to manage freed slaves, offer safe havens, and provide critical logistical support.
Monsters at War & The Findslayer Sword: Combat encounters moving forward are going to be exceptionally demanding. Because our party consists of only four characters, they need every advantage they can get. Finding the powerful magical sword Findslayer during this encounter is crucial for keeping the party combat-viable and empowering them for the brutal fights ahead.
The Smooth Caves & Handouts: The Smooth Caves are essential for setting up the Rockseer Elves encounter later, as they hold "The Lifestone"—a key element for building a relationship with the elves. However, my absolute favorite part of the Smooth Caves is Handouts 13 and 14. As a DM, I love handouts. These are diary pages left behind by a previous adventuring party that died in these tunnels. They instantly inject history, life, and atmosphere into what would otherwise be just another corridor of monsters, providing crucial lore and moody reflections that build real mystery.
Player handout 13 Caves of the Slime Lord: This area yields the next two diary pages (Handouts 15 and 16). Here, the party also encounters Kranin, an evil wizard who escaped the Illithids only to find himself hopelessly trapped in the cave system with no way out. Will the party help him or strike him down? This section also features a trapped Rakshasa. Honestly, I find the inclusion of the Rakshasa here a bit questionable beyond just "it's a cool monster." Its backstory isn't particularly engaging, and since it is strictly of evil alignment, a good-aligned party will likely have no reason to help it, turning it into a pointless, grindy combat encounter.
The Temple of Jubilex: On a much brighter note, I love the Temple of Jubilex. I am a massive fan of Forgotten Realms deity lore, and this gives me a fantastic opportunity to run a striking, memorable encounter that can have long-term consequences. Jubilex will not take kindly to adventurers desecrating his temple; perhaps he will track them down later or place a divine curse upon them. It is an ideal breeding ground for a brand-new personal story arc.
Side Dungeons (Smooth Caves & Slime Lord): While neither of these mini-dungeons is strictly tied to the main campaign narrative, they are vital sources of XP and essential loot for the characters. Furthermore, none of the NPCs encountered in this book are deeply developed with roleplay in mind; their personalities are briefly summarized by basic motivations and desired outcomes. Everything in between is up to me as the DM to invent and flesh out.
Lethal Encounters: Azzuzir and Fandruzsch
Caves of the Reptiles is a notoriously deadly section of the module where an unprepared party can easily walk straight into a TPK (Total Party Kill).
Fandruzsch the shadow dragon guarding his treasure
Azzuzir the Behir: The encounter is initially structured as a pure combat trigger before Azzuzir is ever motivated to talk. However, despite having a relatively low Intelligence (5–7), a Behir isn't completely brainless—it possesses basic tactical awareness and can evaluate its opponents. I recommend making Azzuzir an interactive encounter: start with dialogue, let him test the characters with questions, and offer them choices before he flies into a rage and attacks. It is always more rewarding for players than simply rolling initiative.
Fandruzsch the Shadow Dragon: Tucked away deeper inside Azzuzir’s domain is Fandruzsch. This is an extremely deadly encounter! Shadow dragons possess high intelligence (17–18) and must be played accordingly. He is ancient, deeply aware of his strengths and weaknesses, and entirely comfortable playing with the party like a cat with a mouse before going in for the kill. He is alone down here, hungry for conversation, amusement, and knowledge. Who are these adventurers? What do they want? Where are they going? And most importantly, what do they know about Azzuzir and the items said to influence dragons? Played right, this encounter can be an absolute blast for both DM and players. Can Fandruzsch be turned into a reluctant ally? Must he be fought? Is the resource cost to kill him too high? These are the heavy questions the party must grapple with.
Much of traditional AD&D 2nd Edition design relies on earning XP purely through slaying monsters. But as your players grow more experienced and routine-oriented, they want more substance out of their time at the table. This is where roleplay takes center stage, leaving it up to the DM to transform mechanical monster encounters into rich, memorable social moments—which is precisely what I intend to do here.
The Rockseer Elves & Slavers
Next, we run into what I personally experience as a rather awkward and frustrating encounter: The Rockseer Elves.
They arrive with their own rigid agenda: acquire the Lifestone, interrogate the party about the surface world and surface elves, and force the players to track down a sapphire dragon artifact. Aside from that, there is very little incentive for the party here. The Rockseer Elves are rude, arrogant, and largely indifferent to the plight of fighting the greater evil. Only Darafayen shows any genuine curiosity toward the characters and their mission.
My biggest issue with this encounter is that it effectively attempts to force the characters into cooperation. I know from experience that forced cooperation or railroading goes down terribly with my players; they respond much better to being asked for help than being compelled by alien magic. Furthermore, the module layout suggests splitting the party up over an extended period—having members captured by the elves and returning later with memory gaps of what transpired. I am still deliberating on how to restructure this encounter if the players wander into it, but it will require a custom overhaul. I keep asking myself: Why on earth should the characters help these elves given how poorly they treat them? While the elves can be repurposed as solid allies during the assault on the City of the Glass Pool, they fit much better as secondary support rather than front-line comrades. Once again, the module provides minimal NPC depth, forcing me to build their personalities and motivations entirely from scratch.
Following this, the party runs into a lethal scouting patrol of Slavers working directly for the Illithids, tasked with hauling surface captives down to the City of the Glass Pool. While this is primarily designed as a straight combat encounter, capturing a prisoner alive opens the door to vital intel—specifically, the existence of a renegade clan of Derro. This single piece of information bridges the gap from mindless combat into rich roleplay potential.
The Derro War & Fixing Underdark Travel
The next major campaign milestone offers brilliant opportunities for action, tactical planning, and roleplay: The Derro War.
There are two distinct Derro factions operating here: The Renegades and The Warren of the Servitors. The Renegades are a smaller splinter clan who flatly refuse to be controlled by the Mind Flayers and their dark masters, carving out a hidden existence in a separate cave system. This is a prime sandbox for social engagement. Derro are inherently Chaotic Evil, but they are smart enough to communicate when it serves their survival. It is vital that the characters gather enough intel beforehand to realize an alliance is even possible here.
At the same time, this shouldn't be easy or cheap. The Derro won't just roll over and surrender; their burning hatred for the Illithids and the rival Derro clan must be the driving force behind any temporary alliance—not because they are "nice people." Playing this out will be a massive highlight. Additionally, if the party fights their way through the Warrens of the Servitors, they will discover the sapphire statuette belonging to the Rockseer Elves, neatly tying up that loose thread for the alternate questline if they choose to pursue it.
A Note on Flux Points: Book 2 introduces Flux Points as the campaign's structural solution to the massive, tedious travel distances across the Underdark. Normally, players have to traverse days of grueling, repetitive travel across random encounters through almost the entirety of Book 2 before they finally earn the ability to utilize Flux Points for fast travel and resource conservation. I intend to bypass this artificial gatekeeping. I plan to give the characters access to the mechanics of Flux Points much earlier, entirely removing the requirement that the arrogant Rockseer Elves must be the ones to teach them. The campaign flows much better when players aren't bogged down by endless travel bloat. This might actually be the reason for book 2 to be a slog. Endless travel on foot with a lot of random encounters.
Community and Collaboration: Finding a Fellow DM in the Underdark
It is always a blast to meet like-minded people in the TTRPG community, and the internet gives us the unique opportunity to connect with fellow enthusiasts far beyond our own immediate social circles. Through my preparation and posts on Reddit regarding the Night Below campaign, I got in touch with another Dungeon Master who is running the exact same campaign in AD&D 2nd Edition. Remarkably, we are at roughly the same point in the module!
This has opened up a fantastic channel for us to bounce ideas off each other, collaborate on developing NPCs and roleplay encounters, and—most importantly—have someone to share those specific, behind-the-screen DM thoughts with. I’ve been collaborating closely with u/Lucky_Type, and we work together wonderfully. We regularly split campaign prep work, discuss tactical strategies, and share resources to enhance our tables. Here is a look at some of the material we have exchanged and worked on together...
 |
| Encounter one pager by u/Lucky_Type (AI generated) |
 |
| AI generated by u/Lucky_Type |
Note: I will not be covering the City of the Glass Pool in this post. That massive climax deserves a dedicated entry of its own once my planning for it is fully finalized.
Comments
Post a Comment