The Incident at Baldwin's Beach
The Incident at Baldwin's Beach
When a renowned gnome inventor's experimental "Clockwork Attractant Beacon" malfunctions on a peaceful Sword Coast beach, it summons a chaotic menagerie of confused creatures—from amorous merrow to hypnotized crabs—turning a relaxing day into comedic mayhem. The party must navigate social blunders, mechanical mishaps, and nature's revenge to disable the beacon before sunset, lest the attraction becomes a permanent monster magnet.
Read Aloud
You arrive at Baldwin's Beach on a perfect summer afternoon—white sand stretches before you, gentle waves lap against the shore, and the salty breeze carries the aroma of grilled fish from a tidy beachfront tavern. A dozen tourists lounge on towels, children build sandcastles, and a nervous-looking gnome in goggles stands near a peculiar brass contraption half-buried in the sand, frantically adjusting a spinning crystal while muttering calculations under his breath. Then, inexplicably, a merrow's warbling cry echoes from the water—far too close. Something is very, very wrong.
Description
Baldwin's Beach is a popular tourist destination on the Sword Coast near Neverwinter, known for calm waters and reliable sunshine. The beach is roughly 300 feet of open sand backed by a small boardwalk with merchants, taverns, and rental stalls. The mysterious brass beacon—a chest-high construct of gears, crystals, and antennae—sits 60 feet from the waterline, humming with increasing intensity. The gnome is Tinkertop Baldwin, the beach owner's nephew and a tinkerer of questionable competence. Panicked sunbathers are beginning to gather their belongings as unusual splashes disturb the shallows. The party arrives as tourists, so they have no initial awareness of the beacon's purpose.
DM Notes
Set the comedic tone immediately. The beacon is malfunctioning but unobvious—let the party investigate and piece together what Tinkertop was attempting. DC 12 Arcana check reveals it's magical but not obviously dangerous; DC 14 Investigation reveals it's broadcasting some kind of pheromone-based beacon. Tinkertop is panicked but not hostile—he's desperate for help and will explain his invention if asked: it was supposed to attract "good camping creatures" for a Disney-like petting experience. The merrow encounter is imminent (Scene 3) but this gives the party time to explore, talk to NPCs, and attempt to shut down or understand the beacon. Award inspiration to creative roleplay attempts to calm panicked tourists or gather information. The Rogue and Artificer might immediately want to disable it; encourage creative problem-solving beyond "just smash it."
Read Aloud
You approach the frantic gnome, whose goggles are fogged with panic-sweat. "No, no, no, it's supposed to attract docile creatures, not—OH GODS, is that a giant crab?!" He points at an enormous crustacean emerging from the shallows, its movements hypnotic and dreamlike, walking sideways directly toward a hot dog stand. Tinkertop wrings his hands. "The beacon is supposed to emit a pheromone frequency that attracts only peaceful wildlife—deer, rabbits, songbirds, docile fish. I tested it three times! But something went wrong with the crystal resonance and now it's—it's broadcasting on the wrong frequency!" Another cry from the water. This time, something large moves beneath the surface.
Description
Tinkertop Baldwin (gnome artificer, male, perpetually disheveled) is the beacon's creator. He's genuinely trying to create a passive attraction system for his uncle's beach—a harmless "nature experience" attraction. The beacon's actual malfunction: the crystal inside is resonating at the incorrect frequency, accidentally broadcasting an irresistible pheromone to aggressive, territorial, or sexually driven creatures instead of docile ones. The hypnotized giant crab is the first manifestation (see Encounter 1). Tinkertop can provide the following information with a DC 10 Persuasion check: the beacon should shut down automatically if the crystal inside is removed or smashed; the frequency can be adjusted via the brass dial on the side (DC 13 Tinker's Tools or Artificer check to retune it); or the entire thing can be destroyed, but the magical backlash will stun everyone within 30 feet (DC 13 Dexterity save). The party has 4 rounds before the first major encounter (merrow + allies) begins.
DM Notes
This is the investigation and problem-solving scene. Tinkertop should feel like a hapless ally, not an enemy. His desperation is authentic—he's about to ruin his uncle's business and potentially get people hurt. Bard and Artificer shine here: use Deception to calm tourists, use Arcana/Investigation to understand the beacon, use Tinker's Tools to attempt a fix. Provide hints: the dial on the side is visibly misaligned (off by ~60 degrees); the crystal inside is glowing wrong colors (should be blue-white, but it's sickly green-purple); a faint smell of ozone and fish pheromones emanates from it. The party can attempt multiple solutions, and some are better than others (see Encounter 1 options). Time pressure: emphasize the approaching merrow cries and the giant crab's proximity. If the party asks about magical artifacts or wards, Tinkertop mentions a wave-dampening charm at the tavern that might help contain creatures in a small area—but it's inside, and someone has to convince the bartender (Marta Stonebrew, a dwarf woman) to loan it.
Read Aloud
Your investigation is cut short by a guttural, warbling scream. Three merrow emerge from the shallows, their scaled bodies glistening with brine, their webbed hands grasping crude spears. They lock eyes on the hypnotized giant crab—apparently a delicacy in merrow cuisine—but they also see the beach full of potential mates or rivals. Behind them, the water churns as something much larger approaches. Meanwhile, the giant crab has reached the hot dog stand and is attempting to romance a beach umbrella with concerning enthusiasm. A young couple screams and flees. Tinkertop shouts, "The merrow! The merrow shouldn't be attracted to the beacon—they're aggressive!"
Description
The merrow trio arrives as the second wave of the encounter. The giant crab (animated by the beacon's pheromones into a docile, distracted state) is currently occupied and poses no combat threat but represents a hazard—any creature attacking it will provoke opportunity attacks from its claws (see Encounter 2). The merrow are confused, hungry, and territorial. The water beyond the merrow indicates a fourth creature approaching (the Shambling Mound, from Encounter 3, is 2 rounds away). The beach is now in full panic: tourists are gathering belongings, merchants are closing stalls, and one child is trying to ride the hypnotized crab. The party has roughly 3 rounds before the Shambling Mound arrives and combat becomes genuinely difficult.
DM Notes
This is the transition scene where combat becomes inevitable. The party should feel the rising chaos and time pressure. The merrow aren't initially hostile to the party—they want the crab and/or to dominate the beach. Combat begins when either side attacks. Before combat: offer the party one more chance to attempt beacon disruption (if they haven't already) or to position themselves. The crab is a comedic hazard, not a combatant. If the party can successfully retune the beacon or smash the crystal before the Shambling Mound arrives, the merrow will lose interest and return to the water. The tavern's Wave-Dampening Ward can contain creatures in a 20-foot radius for 1 hour (placed on the ground as a magical circle), giving the party control over where merrow/other creatures are drawn. If Tinkertop hasn't died, he can activate the ward if the party gets it to him. Bards can use Charm Person or other social magic to negotiate with merrow leaders (requires a DC 14 Charisma check, opposed by the merrow's rough intelligence).
Monsters
Tactics
The merrow are territorial and aggressive but not tactically sophisticated. They prioritize: (1) eliminating threats to their food (the crab), (2) dominating the beach, (3) capturing attractive specimens. They'll focus-fire on any character who attacks them, using their glaives and bite attacks in melee. If reduced to 1 HP, a merrow will attempt to flee into the water. They don't understand humanoid speech but respond to loud noises, bright lights, and aggressive posturing. The giant crab is charmed by the beacon and will not attack anything—it mindlessly wanders and attempts to interact with inanimate objects. Any creature that attacks the crab provokes opportunity attacks from its claws (see stat line). The merrow will NOT attack the crab directly while it's being used for their own benefit (food/prize).
Terrain
Open beach with shallow water (0-5 feet deep) extending 30 feet from the waterline, then sloping to deeper water. The sand is soft, imposing no movement penalties but creating no cover. The hot dog stand (flimsy wooden structure) provides half-cover but collapses if a creature uses it for cover while taking damage. Three beach umbrellas and towels provide minimal cover (quarter-cover). The beacon stands 60 feet from the water's edge, humming loudly. If the beacon crystal is shattered or removed, all summoned creatures lose their pheromone-driven compulsion and either flee (merrow) or become docile (crab). The Wave-Dampening Ward (if deployed) creates a magical circle on the ground—creatures within it have disadvantage on saves and melee attack rolls, and creatures outside it have disadvantage on saves and attack rolls if targeting creatures inside.
Read Aloud
As if summoned by the beach's collective nightmare, the water churns violently. A massive plant-like form rises from the deeper water—a Shambling Mound, its bark-like body glistening with brine, seaweed tangled in its limbs. It lets out a sound like cracking timber and lurches toward the beach with ponderous, inexorable steps. Tinkertop shrieks, "The beacon is attracting EVERYTHING! That's not supposed to happen!" The merrow, suddenly aware of competition, shriek their own territorial challenge. The giant crab, oblivious to the chaos, continues trying to befriend a child's pail. Behind the Shambling Mound, you catch sight of movement in the deeper water—more shapes, more creatures, still approaching.
Description
The Shambling Mound emerges as the third wave. Its arrival raises the stakes dramatically and indicates a deadline: if the party doesn't disable the beacon soon, the beach will be overrun by an increasing tide of creatures. The Shambling Mound is attracted to the beacon's pheromones but is also inherently territorial and will attack anything that comes between it and the beacon. If the beacon is still active, one more creature will arrive at the start of round 4 of this encounter (Tinkertop can warn the party: "I count at least five more shapes in the water!"). The party must balance immediate combat threats with the underlying problem: disabling the beacon. Destroying it or removing the crystal will immediately cause all merrow to flee and the Shambling Mound to become docile (losing its driving compulsion), though still hostile if attacked. If the party has managed to deploy the Wave-Dampening Ward, they have an advantage—creatures within the ward's area suffer disadvantage on saves and attacks, creating a controlled zone.
DM Notes
This is the climactic combat scene. Stress the rising chaos and the deadline. If the party hasn't disabled the beacon yet, they now understand the stakes: more creatures are coming, and the beach will be a nightmare of competing monsters within minutes. The Shambling Mound is a serious threat (CR 5, 136 HP) and should feel dangerous, but it's also a slow-moving target that prioritizes moving toward the beacon over engaging the party. Creative solutions are encouraged: if a party member can reach the beacon and disable it, they can end the encounter immediately (though they'll still need to handle the merrow and possibly the Shambling Mound's final attack). If the party is struggling, allow Tinkertop to sabotage the beacon with a loud, successful noise (he can activate a loud steam whistle that stuns all creatures in a 30-foot radius for 1 round on a DC 13 CON save, but he's panicked and might do it anyway for comedic effect). The Rogue can attempt to sneak to the beacon and disable it (DC 15 Stealth, then DC 14 Tinker's Tools or similar). The Artificer can identify the exact mechanism needed to disable it (DC 13 Arcana or Tinker's Tools).
Monsters
Tactics
The Shambling Mound is drawn to the beacon and treats it as its primary objective. It will move toward the beacon at its maximum speed (20 feet per round), attacking any creature that blocks its path or attacks it. It uses its Multiattack action to make two slam attacks, followed by attempts to grapple Medium or smaller creatures and engulf them. It has 136 HP and regenerates 10 HP per round as long as it is in contact with water or moist ground (the beach qualifies). Its Lightning Absorption trait means any lightning damage heals it instead of damaging it. The Shambling Mound is not intelligent and cannot be negotiated with, but it can be distracted by loud noises, bright lights, or being grappled. If the beacon is disabled or its crystal removed, the Shambling Mound loses its driving compulsion and becomes indifferent to the party, though still hostile if attacked. It will not pursue the party into the tavern or away from the beacon.
Terrain
The beach continues to be open sand with shallow water. The Shambling Mound's movement tears up significant portions of the beach, creating divots and loose sand that count as difficult terrain for creatures smaller than Large (the Shambling Mound ignores this). The tavern and merchant stalls are 80 feet from the beacon (safe distance but visible and accessible for retrieving items or NPCs). The beacon is now the focal point—if the party can reach it and disable it, the encounter ends. The Wave-Dampening Ward, if deployed, affects only Small and Medium creatures (not the Shambling Mound, which is Large).
Read Aloud
With a sound like shattering glass, the beacon's crystal splits in half. The humming stops. The green-purple glow fades. Instantly, the merrow lose interest and slip back into the water with territorial calls. The Shambling Mound's movements become sluggish, then stop entirely—it stands in the shallow water like a monument to chaos, immobile and indifferent. The giant crab releases the beach umbrella it was hugging and wanders harmlessly toward the deeper water. The beach is a disaster: sand scattered everywhere, the hot dog stand smoking, frightened tourists emerging from the tavern and storefronts, and one very confused gnome standing amid the wreckage of his invention. Then, you hear the unmistakable voice of an older gnome shouting from the boardwalk: "TINKERTOP! What in Gond's blessed circuits did you DO?!"
Description
The immediate danger has passed. The party has successfully disabled the beacon (either by shattering the crystal, removing it, or retuning it—the method varies based on their choices). Now comes the clean-up and awkward social encounter. Tinkertop's uncle, Baldwin Stonebottom (a gnome merchant in his 60s), has arrived for the evening shift and immediately sees the disaster. Tourists are shaken but largely unharmed. The giant crab and Shambling Mound pose no further threat—the crab wanders back into deeper water, and the Shambling Mound becomes inert. Tinkertop is simultaneously grateful, ashamed, and panicking about his uncle's reaction. The tavern keeper, Marta Stonebrew, emerges to survey the damage with a stoic expression.
DM Notes
This is the roleplay and resolution scene. Focus on the social consequences and comedic fallout. Baldwin Stonebottom is furious but ultimately reasonable—he's more disappointed than angry at Tinkertop. The party should be thanked by tourists and beach-goers. Marta will want her Wave-Dampening Ward returned if the party borrowed it; she'll appreciate a gift or favor in return (she's not greedy, but she doesn't loan out magical items for nothing). Tinkertop will apologize profusely and offer to pay the party from his meager savings (50 gp total—he's broke and desperate). Baldwin, once his initial rage passes, will recognize that the party saved the beach from total destruction and offer a more substantial reward (see Treasure). Allow the party to interact with tourists, gather rumors about other beach incidents, or simply enjoy the comedic denouement. This is the calm after the storm—provide a moment of levity and resolution before the final scene. If the party asks questions about why the beacon malfunctioned, Tinkertop or Baldwin can explain that the crystal was likely damaged during transport or installation, causing the frequency to misalign. It was a genuine accident, not sabotage.
Read Aloud
As the sun begins its descent toward the horizon, painting the water in shades of gold and crimson, the beach gradually returns to a semblance of normalcy. Tourists return to their towels (now with stories to tell for years). Marta has set up a impromptu celebration at her tavern—free drinks for the heroes of the day, courtesy of Baldwin himself. Tinkertop sits quietly at a corner table, sketching ideas for a new, safer invention on a piece of parchment (a "non-sentient sand sculpture device," which will probably also cause disaster). As you toast to a successful day, Baldwin approaches with a knowing smile. "You've done my beach—and my nephew—a great service today. I've contacts all along the Sword Coast. If you ever need work in this region, my name opens doors. And if you ever want to invest in a PROPERLY engineered beach attraction..." He leaves the invitation hanging, along with a substantial reward for your troubles.
Description
The final scene wraps up the session on a comedic and satisfying note. The beach is being restored by locals (tourism will resume tomorrow). The party has earned recognition and genuine thanks from the community. Baldwin offers a standing recommendation and hints at future opportunities. Marta is gracious and will remember them favorably if they return to the Sword Coast. Tinkertop, humbled and chastened, has learned a lesson about testing inventions in safe locations. The sun sets, and the beach becomes peaceful once more—a stark contrast to the chaos of the afternoon. The party can rest, socialize, or gather information about the region. This is a chance to decompress and celebrate before moving on to the next adventure.
DM Notes
End the session on a high note. Emphasize the comedic resolution and the party's success. If players want to ask questions about future hooks or opportunities, Baldwin and Marta can provide information about other beach-related mysteries or merchants looking for adventurers. The session is designed to be self-contained, but hints at the broader world: rumors of other malfunctioning inventions along the coast, a traveling clockmaker who sold Tinkertop the crystal (possibly corrupt or sabotaging), or a greater force behind the beacon's miscalibration (play this as a joke—it's probably just a manufacturing defect). Award the party their treasure and allow them to roleplay their celebration. If time permits and the party wants to continue, you can add a secondary scene: that night, they hear reports of other strange phenomena on the coast (possibly setting up for a future session), or they encounter a mysterious figure who was watching the beacon incident from afar (a hook for intrigue). Keep the tone light and avoid returning to serious drama.
250 gp (split among the party, ~50 gp per character) plus a standing letter of introduction that grants advantage on Persuasion checks when dealing with Sword Coast merchants and inn-keepers.
A poorly made but genuine Gnomish Clockwork Amulet (reskin as a wondrous item, uncommon rarity). It grants +1 to Initiative checks. The craftsmanship is clearly amateur, and it occasionally makes a loud ticking sound at inappropriate moments.
One week of free board and meals at Marta Stonebrew's Tavern (Baldwin's Beachside Inn). Includes a private room and access to local gossip and rumors.
Marta gifts the party a small vial of Water from the Wave-Dampening Ward. Once per day, the holder can use it to cast Water Breathing on themselves as a bonus action (no spell slot required). Uses reset after a long rest. Marta made it clear: don't tell anyone she gave this away. It's against her better judgment.
Story Hooks
The party has earned Baldwin Stonebottom as an ally and contact along the Sword Coast. His letter of introduction can be used to gain favor with merchants, inn-keepers, and other business owners in the region. Tinkertop hints that his "supplier," a traveling gnome clockmaker named Sprocket Whitestone, may have sold him a defective crystal intentionally. Was it an accident, or was someone trying to cause chaos on the beach? (Hook: Whitestone is actually an agent of a sabotage ring targeting gnomish communities to discredit their inventions.) Additionally, Marta mentions that she's heard rumors of other "malfunctioning" magical items appearing along the Sword Coast—beacons, wards, and artifacts that are behaving erratically. Is there a pattern? A conspiracy? Or just bad luck? (Hook: A villain is distributing cursed magical items to destabilize communities and create opportunities for theft or conquest.)
Conclusion
Wrap Up
As night falls on Baldwin's Beach, the party relaxes in the tavern, drinks in hand and bellies full. The beach outside is calm, the tourists safely tucked into nearby inns, and the creatures of the deep have returned to their homes. Tinkertop has promised (unconvincingly) that his next invention will be "totally safe and definitely won't attract any dangerous creatures." Baldwin has laughed for the first time all day. Marta is already planning how to explain the magical vial she gave away. The day that started as a simple beach visit has ended with a catastrophe averted, friendships forged, and stories that will be told for years to come.
Cliffhanger
Late that night, as the party is retiring to their rooms, a frantic messenger arrives at the tavern on horseback, covered in road dust. "We need adventurers in Waterdeep! There's been an incident at the Grand Market—magical artifacts malfunctioning everywhere, creatures appearing from nowhere, chaos in the streets! If you can help..." Baldwin's hand tightens on his drink. He exchanges a knowing look with Marta. "Just like the beacon," he says quietly. "Just like Tinkertop's 'accident.' I don't think this is over."
Next Session Hooks
- Investigate Sprocket Whitestone, the traveling gnome clockmaker, who may be intentionally distributing defective or cursed magical items.
- Journey to Waterdeep to respond to the market crisis and discover if there's a larger pattern of sabotaged artifacts.
- Pursue rumors of a sabotage ring operating along the Sword Coast, targeting gnomish communities and magical installations.
- Recover the damaged beacon crystal from the beach (it's a valuable research specimen) and sell it to interested scholars or wizards—or discover that someone is actively collecting these malfunctioning crystals for a nefarious purpose.
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