“Every stone has a story. Every tunnel has a secret. I just happen to collect both.” — Venna Deepdelve
You smell it before you see it — damp stone and old leather, mineral dust and lamp oil, and something else, something faintly electric that prickles the hair on your arms. A narrow stairway descends from the market level into a natural fissure in the mountain’s bones, where a single iron lantern hangs above a door carved to look like a gaping cavern mouth. The sign reads: The Hollow Lantern — Curiosities from Below.
You smell it before you see it — damp stone and old leather, mineral dust and lamp oil, and something else, something faintly electric that prickles the hair on your arms. A narrow stairway descends from the market level into a natural fissure in the mountain’s bones, where a single iron lantern hangs above a door carved to look like a gaping cavern mouth. The sign reads: The Hollow Lantern — Curiosities from Below.
Inside, the ceiling vaults upward into natural stone, and every surface is crowded with the spoils of a lifetime spent in the deep places of the world. Fossil slabs lean against walls. Jars of luminescent fungi pulse with soft blue-green light on high shelves. Maps — dozens of them — are pinned to corkboard frames or rolled in leather tubes, their edges stained with the red clay of tunnels no surface-dweller has ever walked.
Behind the counter, a dwarf with ash-gray hair and milky-pale eyes looks up from a magnifying loupe. She doesn’t squint. She doesn’t need to. Deepdelve eyes were made for darker places than this.
Venna “Echostone” Deepdelve
Race: Dwarf (Deepdelve Clan) Alignment: Neutral Good Occupation: Retired Deep Explorer, Curiosity Merchant
Venna Deepdelve spent sixty-three years as a tunnel scout for the Deepdelve Clan’s Survey Corps, mapping passages that hadn’t seen light since before the Age of Disasters. Her clan designation was “Echostone” — a title earned by scouts who have navigated unmapped sections of the deep tunnels using nothing but sound and instinct. She earned the name at twenty-nine, when she led a lost survey team back to safety through two miles of collapsed passage by tapping her hammer against the walls and listening for the echo patterns that indicated open air ahead.
She retired after a cave-in in the Lower Reaches took her left hand at the wrist. The prosthetic she wears now — a mechanical hand of articulated bronze and iron, crafted by a Forgefire artificer — works well enough for sorting inventory and making change, but lacks the sensitivity needed to read stone by touch. For a Deepdelve scout, that’s the same as a painter losing their sight.
Rather than fade into bitter retirement, Venna opened The Hollow Lantern. She sells the things she’s spent a lifetime collecting: geological specimens, salvaged relics, specialized exploration gear, and maps to places most people are too sensible to visit. Her shop has become an unofficial gathering point for adventurers heading underground, and Venna is always willing to share advice — though her counsel tends toward caution. She’s seen too many bold delvers carried out under canvas to encourage recklessness.
Roleplaying Venna
Voice and Manner: Venna speaks quietly and deliberately. She pauses before answering questions, not from slowness but from a habit of listening. Underground, speaking too quickly can mean you miss the sound of shifting rock. She taps her bronze fingers on the counter when she’s thinking — a rhythmic, almost musical sound.
Personality Traits: Patient and observational. She notices things — the quality of a customer’s rope, the wear pattern on their boots, whether they flinch at sudden noises. She’ll offer unsolicited advice to anyone she thinks is about to get themselves killed, but she won’t push if they refuse it.
Ideal: “The deep places don’t care about your courage. Preparation is what brings you home.”
Bond: She maintains contact with active Deepdelve scouts and will go to considerable lengths to help anyone who aids the clan’s survey work.
Flaw: She’s overly protective. If she decides a customer isn’t ready for what they’re buying, she may refuse the sale entirely — or quietly substitute a safer alternative and pretend it’s what they asked for.
NPC Stat Block
Venna “Echostone” Deepdelve Medium humanoid (dwarf), neutral good
Armor Class 12 (leather armor) Hit Points 45 (7d8 + 14) Speed 25 ft.
| STR | DEX | CON | INT | WIS | CHA |
| 12 (+1) | 10 (+0) | 14 (+2) | 16 (+3) | 18 (+4) | 11 (+0) |
Saving Throws Wis +6, Int +5 Skills Investigation +5, Perception +8, Survival +8, Nature +5, History +5 Senses Superior Darkvision 120 ft., passive Perception 18 Languages Common, Dwarvish, Undercommon, Terran Challenge 2 (450 XP)
Stonecunning. Whenever Venna makes an Intelligence (History) check related to the origin of stonework, she is considered proficient in the History skill and adds double her proficiency bonus to the check.
Echostone Training. Venna has advantage on Wisdom (Perception) checks that rely on hearing while underground. She can accurately map a space up to 60 feet in radius using sound alone (1 minute of concentration required).
Hazard Sense. Venna has advantage on saving throws against traps and hazards in underground environments. She can use a bonus action to alert allies within 30 feet, granting them advantage on their next saving throw against the same hazard.
Mechanical Hand. Venna’s bronze prosthetic functions as a normal hand for most purposes but imposes disadvantage on checks requiring fine tactile sensitivity (lockpicking, sleight of hand, reading Braille or carved runes by touch).
Shop Inventory
The Hollow Lantern stocks a rotating selection of exploration supplies, geological curiosities, and recovered relics. Below is a representative sample of what adventurers might find on any given visit. Venna adjusts her prices fairly but doesn’t haggle much — she knows what her goods are worth.
1. Deepdelve Survey Chalk (Consumable)
Price: 5 gp per set of 6 sticks Weight: — (negligible)
Six thick sticks of specially formulated chalk in distinct colors (white, red, blue, yellow, green, orange). Deepdelve scouts use standardized markings to communicate tunnel conditions to those who follow. Each stick can mark approximately 200 feet of tunnel wall before it’s exhausted.
Mechanics: A character proficient in Survival can use Deepdelve chalk to leave coded markings. Any creature that succeeds on a DC 10 Intelligence (Investigation) check can follow the trail. Creatures familiar with Deepdelve survey marks (Deepdelve clan members, experienced miners, or anyone who succeeds on a DC 15 Intelligence (History) check) can also read the coded warnings embedded in the color choices and symbol patterns, gaining advantage on checks to detect hazards that have been marked.
Venna’s Note: “Red means danger. Blue means water. White means safe passage. If you see all three together, it means someone found water in a dangerous place and survived — which is the most useful kind of information there is.”
2. Echostrike Hammer (Wondrous Item, Uncommon)
Price: 250 gp Weight: 2 lbs. Requires Attunement: No
A small, heavy-headed hammer with a mithral striking face and an ironwood handle wrapped in worn leather. When struck against stone, it produces a resonant tone that trained ears can read like a map.
Mechanics: As an action, a creature can strike the hammer against a stone surface. All creatures within 60 feet who can hear the resulting tone learn the following about the surrounding stone within that radius: the presence of open cavities or passages, the location of water sources, and areas of structural instability. This information is conveyed as a general sense of direction and distance (near, moderate, far), not precise measurements. Usable 3 times per day, recharging at dawn. The sound is audible to creatures within 120 feet and may attract attention.
Venna’s Note: “My old one saved my life more times than I can count. This one I pulled from a sealed Deepdelve cache during the Survey of the Lower Reaches. Still works perfectly — mithral doesn’t forget its purpose.”
3. Lantern of Dimming (Wondrous Item, Common)
Price: 50 gp Weight: 2 lbs.
A hooded lantern with a clever shutter mechanism designed by Deepdelve engineers. A dial on the base allows the user to adjust light output in precise increments, from full brightness down to a barely-visible glow that won’t ruin darkvision.
Mechanics: As a bonus action, the wielder can adjust the lantern between four settings: Full (normal hooded lantern, bright light 30 ft., dim light 30 ft.), Half (bright 15 ft., dim 15 ft.), Low (dim light 10 ft. only), and Ember (dim light 5 ft., does not impose disadvantage on creatures with darkvision within 30 ft.). Burns oil at the normal rate regardless of setting. The Ember setting is specifically designed for mixed parties — it provides just enough light for humans to avoid obstacles without blinding their darkvision-equipped companions.
Venna’s Note: “Surface folk never think about how bright their torches are until something three tunnels over comes to investigate. This’ll keep your humans from tripping over their own feet without announcing your position to everything in the underdark.”
4. Petrified Echolocust (Curiosity / Wondrous Item, Common)
Price: 35 gp Weight: 1 lb.
A fist-sized fossilized insect, its crystallized wings still partially translucent. Echolocusts were creatures that once filled the deep caverns of the Oreholds in vast swarms. They navigated by sound, producing clicks at frequencies most surface creatures can’t hear. The species has been extinct for centuries, but their petrified remains occasionally retain a faint resonance.
Mechanics: Once per long rest, a creature holding the Petrified Echolocust can activate it as an action, causing it to emit a burst of clicking sounds at the edge of hearing. For 1 minute, the user gains blindsight out to 15 feet. The clicks are audible to creatures with keen hearing (passive Perception 15+) within 30 feet.
Venna’s Note: “I find these in old nesting caverns, usually near underground rivers. Most are just pretty rocks. About one in twenty still clicks. This one clicks.”
5. Deepdelve Wayfinder’s Journal (Adventuring Gear)
Price: 75 gp Weight: 1 lb.
A compact, leather-bound journal with waterproofed pages and a system of pre-printed grid templates designed for underground mapping. Includes a fold-out reference card of standard Deepdelve survey symbols, geological shorthand, and distance estimation techniques. The cover contains a small built-in compass and a tiny vial of phosphorescent ink for writing in total darkness.
Mechanics: A character using this journal to map an underground area gains advantage on Wisdom (Survival) checks to avoid becoming lost in areas they have previously mapped. The phosphorescent ink glows faintly for 24 hours after application (not bright enough to read by for non-darkvision creatures, but visible to those with darkvision). The journal contains enough pages and ink for approximately 30 days of active mapping.
Venna’s Note: “Every scout carries one. I’ve filled forty-six of these in my career. Each one is a record of places no one else has seen. Yours will be too, if you’re lucky.”
6. Breath of the Mountain (Potion, Uncommon)
Price: 150 gp Weight: ½ lb.
A small stone flask sealed with beeswax, containing a thick, mineral-heavy liquid that tastes like wet granite and iron filings. Brewed by Deepdelve alchemists using trace minerals collected from deep underground springs, it was originally developed to protect scouts working in areas with toxic gas concentrations.
Mechanics: After drinking this potion, a creature gains immunity to inhaled poisons and toxic gases for 4 hours. During this time, the creature can also hold its breath for up to 30 minutes (instead of the normal duration based on Constitution). The potion does not protect against magical effects that target breathing, such as cloudkill — only naturally occurring or alchemically produced gases and airborne toxins.
Venna’s Note: “The deep tunnels breathe, and not everything they exhale is safe. Methane pockets, sulfur vents, old coal fires that have been smoldering for centuries. This won’t make the air clean, but it’ll keep you alive long enough to find air that is.”
7. Shardlight Crystal (Wondrous Item, Uncommon)
Price: 200 gp Weight: — (negligible)
A thumb-sized crystal shard, naturally luminescent, harvested from deep geological formations. When held, it emits a steady, cold light with a distinctly blue-white hue unlike torchlight or magical illumination.
Mechanics: The crystal sheds bright light in a 20-foot radius and dim light for an additional 20 feet. Unlike a torch or lantern, this light does not flicker and cannot be extinguished by wind or water. As an action, the holder can press the crystal against any stone surface, where it adheres and continues to glow. It can be removed with another action. Additionally, when placed against worked stone (brick, carved tunnel walls, etc.), the crystal’s light reveals hairline cracks, hidden seams, and structural weaknesses within its bright light radius — granting advantage on Intelligence (Investigation) checks to find secret doors or assess structural integrity in stone constructions.
Venna’s Note: “Gemheart artisans charge triple for these because they polish them pretty. I sell them rough-cut because you’re not buying jewelry, you’re buying survival. The light never dies — I’ve found these still glowing in tunnels that were sealed a thousand years ago.”
8. Cartographer’s Cask (Wondrous Item, Uncommon)
Price: 300 gp Weight: 3 lbs.
A cylindrical brass case, roughly the size of a scroll tube, engraved with Deepdelve survey markings. Inside, a complex arrangement of lodestone needles, spirit levels, and graduated crystal rods provides remarkably precise measurements of depth, distance, and inclination underground — where normal compasses fail and the sun can’t guide you.
Mechanics: While underground, a character proficient in cartographer’s tools or navigator’s tools can use this device to determine the following (each requiring 1 minute of calibration): their approximate depth below the surface (accurate to within 50 feet), the compass direction of true north (unaffected by magnetic interference), and the grade and direction of any slope within 30 feet. A character using both this device and a Deepdelve Wayfinder’s Journal to map an underground area creates maps of exceptional accuracy — these maps can be sold to the Deepdelve Clan Survey Corps for 50-200 gp depending on the area’s value, and using them grants advantage on all navigation checks in the mapped area for any creature who studies them for at least 10 minutes.
Venna’s Note: “Built by a Forgefire artificer to Deepdelve specifications. Forty-seven moving parts, each one precision-ground. I have three of these. This one’s for sale. The other two are not, and I’ll thank you not to ask about them.”
9. Tunnel Rat’s Friend (Wondrous Item, Common)
Price: 25 gp Weight: ½ lb.
A small pouch of fine powder with a sharp, acrid smell — a blend of sulfur, ground iron, and dried cave pepper cultivated by Deepdelve herbalists. Originally developed to discourage the giant vermin that plague deep tunnels, it has found broader use among underground explorers.
Mechanics: As an action, a creature can scatter the powder in a 10-foot square area. For 8 hours, beasts of CR ½ or lower (giant rats, giant centipedes, swarms of insects, etc.) that enter the area must succeed on a DC 12 Constitution saving throw or be repelled, unable to willingly enter or remain in the area for 1 minute. Creatures that succeed are immune to this particular application. The pouch contains enough powder for 3 uses. The powder is rendered inert if it gets wet.
Venna’s Note: “It won’t stop anything that actually wants to kill you, but it’ll keep the biters and crawlers out of your bedroll. Down below, a good night’s sleep is worth more than a magic sword.”
10. Map of the Thornback Passage (Unique)
Price: 500 gp (Venna may refuse to sell depending on the buyer) Weight: — (negligible)
A meticulously drawn map on treated leather, showing a winding passage through an unmapped section of tunnels beneath the eastern foothills. Venna’s own survey marks are visible in the margins, along with personal annotations in Deepdelve shorthand.
Mechanics: This map details a 3-mile underground passage connecting the Lower Market Tunnels of Mithralreach to a natural cavern system that opens to the surface in the eastern foothills. The passage includes notations for two fresh water sources, one area of structural instability, and a large chamber marked with the Deepdelve warning glyph for “unknown presence — proceed with caution.” A character following this map has advantage on all Survival checks to navigate the passage and cannot become lost. The “unknown presence” chamber has not been explored — Venna’s notes simply read: “Something lives here. It didn’t follow me. I didn’t go back.”
Venna’s Note: “I mapped this passage eleven years ago and I’ve never sold it. I’m not sure I should sell it now. But if you’re serious — truly serious — about what’s down there, then having a map is better than going in blind. I’ll want to know who you are before I hand this over.”
Adventure Hooks
Hook 1: The Silent Survey
A team of three Deepdelve scouts left Mithralreach six weeks ago to resurvey a section of deep tunnels that had been sealed since the Age of Disasters. They were expected back in four. Venna hasn’t slept properly in days — one of the missing scouts, Tormund Deepdelve, is her nephew.
She approaches the party quietly, without dramatics. She has a map of the last known route, three doses of Breath of the Mountain, and 500 gp she’s pulled from her savings. She needs people willing to go down and find out what happened. She’s honest about the risks: the sealed tunnels were closed for a reason, and whatever that reason was hasn’t improved with age.
What Happened: The scouts broke through a sealed wall into a cavern system that predates the current Oreholds by centuries — ruins from the kingdom of Khaz-Ankor, abandoned during the Age of Disasters. Two scouts are alive but trapped behind a collapsed passage, running low on supplies. The third is dead, killed by a defense mechanism in the ruins — an animated stone guardian that still follows ancient orders to protect the site. The ruins contain valuable historical artifacts and survey data, but the guardian must be dealt with (it can be destroyed, bypassed, or potentially deactivated by someone who reads Dwarvish and can puzzle out the ancient command runes — Intelligence (Arcana) DC 18).
Rewards: Venna pays the promised 500 gp and becomes a reliable ally and source of information for future underground expeditions. The Deepdelve Clan Survey Corps pays an additional 200 gp for the survey data from the Khaz-Ankor ruins. The ruins themselves contain treasure and historical significance that could fuel further adventures. Tormund, if rescued, is a capable scout (use the Scout stat block from the Monster Manual with darkvision 120 ft.) who may join the party for future underground delves.
Hook 2: The Collector’s Offer
A well-dressed Goldbeard merchant named Haldric Coinweaver visits The Hollow Lantern and makes Venna an extraordinary offer: 5,000 gp for the contents of her entire back room — her personal collection of survey journals, geological specimens, and maps accumulated over sixty-three years of deep exploration. That’s more than the shop is worth. That’s more than Venna could earn in a decade.
She turns him down. He comes back the next day with a higher offer. She turns him down again. On the third day, he doesn’t come to the shop — but that night, someone breaks in and steals three of her oldest survey journals.
Venna asks the party to recover the journals. She can’t go to the Ironhand guard because the journals contain maps to locations the Deepdelve Clan considers classified — routes to sealed tunnels, water sources, and emergency passages that the clan uses for evacuation planning. If those maps became public knowledge, it would compromise the Oreholds’ security.
What’s Really Going On: Haldric is acting as a middleman for a surface-world cartography guild that wants to publish a comprehensive atlas of the Oreholds’ underground passages. The guild’s motives aren’t necessarily malicious — they see it as an academic and commercial venture — but the Deepdelve Clan views the underground network as a strategic military asset. The stolen journals are being held at Haldric’s warehouse in the Goldbeard trading quarter. The party must recover them, but the situation is complicated by the fact that Haldric has hired private guards (use Thug and Veteran stat blocks) and the warehouse is in Goldbeard territory, where breaking and entering could spark a clan dispute.
Rewards: Venna provides any three items from her shop inventory (player’s choice) and becomes a deeply loyal contact. The Deepdelve Clan, if informed of the security breach, rewards the party with 300 gp and grants them “Friend of the Deep” status — advantage on Charisma checks with Deepdelve clan members and access to Deepdelve waystations in the upper tunnels (safe rest points with fresh water and emergency supplies). How the party handles Haldric — turning him in, negotiating with the cartography guild, or finding a compromise — could have lasting political consequences between the Goldbeard and Deepdelve clans.
DM Tips: Using The Hollow Lantern
The Hollow Lantern works as more than a place to buy gear. It’s a narrative hub — a location where underground adventure begins and ends. Here are a few ways to weave it into your campaign.
As a quest board: Venna hears things. Deepdelve scouts pass through her shop regularly, and she picks up rumors about new discoveries, sealed passages that have been breached, and strange sounds in the deep tunnels. She won’t hand out quests like a job board, but she’ll mention things in conversation — and she respects adventurers who follow up.
As a knowledge resource: With her +8 to Survival and Perception, extensive underground experience, and network of Deepdelve contacts, Venna is one of the best people in Mithralreach to consult before heading underground. She can identify geological specimens, translate Deepdelve survey marks, and provide general advice about underground hazards. She won’t charge for advice, but she’ll remember who listened and who didn’t.
As an emotional anchor: Venna is a person who lost the thing she loved most — her ability to explore — and found a way to keep living. She’s not tragic. She’s not bitter. She’s adapted, the way Deepdelve dwarves have always adapted. That makes her a grounding presence for campaigns that deal with loss, disability, or change. She’s proof that the story doesn’t end when the adventure does.
The Hollow Lantern is part of the Oreholds campaign setting. For more dwarven content, including mining mechanics, clan lore, and adventure supplements, explore the rest of the series.
