Tunnel Dungeon (RDG)

Tunnel dungeons are densely occupied labyrinthine networks teeming with humanoid inhabitants beneath the surface. Ever-growing due to the ceaseless activities of their denizens, the tunnels and rooms serve as homes, fortresses, and treasure troves. Occupants must protect themselves against threats from both above ground and below, often employing elaborate defenses, traps, and architectural innovations. While treasures abound, stirring up too much attention may cause a group of intruders to become overwhelmed by the sheer number of potential adversaries.

Entrances to these areas serve as pivotal junctures requiring protection to ensure the safety of the inhabitants, many of whom are likely non-combatants, including children, who contribute to the community's productivity. Multiple defensive measures are typically in place, encompassing strategies that may involve personal sacrifice and, crucially, the activation of an alarm. It's worth noting that not all entrances are externally guarded; some tunnel dungeons may appear innocuous to passersby. However, upon entry, individuals should anticipate encountering immediate resistance from defenders within the area.

However, exceptions exist to this pattern. Certain dungeons may remain undisturbed for extended periods, spanning months or even years, leading the inhabitants to grow complacent regarding the need for vigilance. While it's conceivable that a group could enter without encountering any resistance, such occurrences are rare.

Typically, guards or sentinels are there to apprehend intruders by surprise or to fiercely defend their territory if provoked. These are non-levelled, yet trained as soldiers, so that in addition to their hit dice/body mass they'll have 2-5 additional hit points from training. For example, a soldier hobgoblin has 1+1 HD and 1-8 h.p. per die, +2-5 h.p. for training, for a total of 4-14 h.p. They have a morale of 7 or better, depending on race.

1st Level Dungeon

Tunnel Dungeon Entrance

Entrances come in a variety of sizes and forms, serving as essential transitional points from the external environment to the interior of the dungeon. The design of these entryways necessitates a relatively modest outer footprint to avoid drawing undue attention to the dungeon, which could prompt intervention from influential local figures determined to eradicate any perceived threats. By maintaining a discreet external presence, these entrances help to minimize the risk of discovery and subsequent attempts to eliminate the dungeon's inhabitants.

Die rolls indicated are on a d20. Each percentage shown is rolled individually to see if that feature exists. All passages, unless stated otherwise, are 5 ft. wide.

Tunnel Dungeon Entrance

Roll	Result
01-23	Large opening into abandoned mine, either level or somewhat sloped (1-15) or occurring as a vertical shaft (16-20). May have covert sentinels (40%).
24-32	Palisaded yard, 20 ft. diameter; gate permits access, guarded by evident soldiers. May have one tower (20%). Sealed door into tunnels located within palisade. Replace palisade with stone circle 5% of the time.
33-93	Small opening, deserted and obscured by vegetation (1-9), amid scattered boulders (10-16), beneath a low, crumbling archway (17-19) or hidden beneath a rusted iron grate (20).
94	Submerged cave, accessible only by diving beneath the water's surface and swimming through a entranceway passage to an interior, breathable hewn passage.
95-00	Timbered door set into a rocky face of a cliff. May be barricaded (25%) and/or guarded by 2-4 evident soldiers (50%); otherwise deserted.

Large openings give way to a long undisturbed passage about 60 ft. in length, which must be traversed before learning what is in space beyond. Outside the abandoned mine, there are bound to be remnants of mine carts, with wooden structures, timber and scattered tools. An investigation should reveal that these have been moved or examined in the recent past. If there are covert sentinels, these are positioned discreetly, hidden from view among rocks or vegetation, watching the players and waiting for an opportunity to take them by surprise. If there are sentinels, roll on the humanoids level 1 table to determine race of humanoid for the sentinels for the habitat below.

Palisaded yards may be half-circles or three-quarter circles, depending on the terrain; the palisade is 15 ft. high. The dungeon door will give way to a 20 ft. passage that slopes downwards at 4-24 degrees. This door is 7 ft. high, 4 ft. wide and 4 in. thick; because it's in constant use, it won't be stuck, barred or bolted. Towers consist of a frame supporting a platform 20 ft. off the ground, 8 ft. wide, with a single archer on top if the tower is present; this is in addition to the 3-8 evident soldier guards that are present. Each is equipped with a horn for giving an alarm. There is a 10% chance for each guard that a chained watch animal is also present. If a stone circle is indicated, this is also 15 ft. high and 2 ft. wide; add an addition 2-4 evident guards. Palisades and stone circles also include a gong for giving an alarm. As with the covert sentinels above, roll to determine the race of the humanoid for this area and below. The total number of guards positioned outside the dungeon cannot exceed the total number of warriors.

Small openings are 2-3 ft. wide and always concealed, requiring 10 to 60 minutes to locate. They are deserted, without guards or sentinels, and are rarely used (if at all) by the residents. There is a 10% chance of a trap being located around the entrance. The narrow opening enters upon a similarly narrow passage that descends 4-10 ft.; from the bottom, the passage continues for 5-20 ft. before reaching the space beyond.

Submerged passages are completely full of water, which may be presumed to be clear. Torches and other illumination sources, however, cannot be lit on the other side without first having an opportunity to dry. The entryway descends 7-12 ft. downwards to a 4-6 ft. wide opening, which continues for 6-18 ft (4d4+2). They open at the top of a passage that's a mere 10 ft. before the inside space.

Timbered doorways consist of a dungeon door without fortification set into the stone exterior as an entranceway into the dungeon. If not barricaded or guarded, there is again a 10% chance of a trap. Inside the door is a 20 ft. passage leading to the inside space. If there are guards, as with the covert sentinels above, roll to determine the race of the humanoid for this area and below.

Initial Space Behind Entrance

This describes the area first encountered once passing through the entrance, occurring at the end of whatever distance has been described under the tunnel entrance, above. This area describes what additional defenses are positioned between the characters and the interior of the habitat, if any. As before, passages are 5 ft. wide and where indicated, are 20 ft. long before a check on the periodic check table is made, below. Where a door is opened, check afterwards on the space beyond door table.

Tunnel Dungeon Entrance

Roll	Result
01-06	Alarm; bells and other devices have been rigged throughout the passage to alert inhabitants once an entry has been made.
07-45	Guardroom; 15 ft. diameter circular room with 2-3 soldiers that have been posted to monitor and control access to the habitat. Open to the approach passage. Includes furniture, one dungeon door on far side.
46-60	Obstruction; bars passage, providing 2 archers cover equal to +6 AC, with an additional guard to raise the alarm, as with the 'guardroom' above. Passage continues beyond obstruction.
41-69	Passage; undefended. There are signs of evident travel over the surface of the passage, but there are no defenses of any kind in place, not even a trap. Make periodic check at end of passage.
70-93	Portcullis; bars passage, with single guard on duty to raise the alarm, as with the 'guardroom' above. Passage continues beyond the portcullis.
94-97	Reinforced doors; open, attended by two guards, who are ready to seal them against intruders as soon as they're able; characters must rush forward to arrest the doors before they close, as they will lock in place once shut.
98-99	Trap has been placed in passage; consult trap table. Trap may be place at any point along 20 ft. passage.
00	Watch beast has been chained here to guard passage; the beast will fight to the death. Consult trained animal table.

Alarms are clearly visible, serving as a deterrent by their mere presence. Most unintelligent creatures will likely ignore them and trigger the alarms. Navigating through the area without setting off the alarms requires both a dexterity check AND a saving throw vs. breath weapon; to remove the alarm requires an ability to remove traps. If an attempt to disable the alarm fails, a substantial amount of material falls to the floor, alerting the inhabitants to the presence of intruders.

Guardrooms may vary in shape but are typically small, as limited access is part of their design. The guards are likely to be bored from endless days of "watching," and must make a surprise check once player characters come within 40 feet. Players, as intruders, need not make this check. If the guardroom is at the head of a mine tunnel, or if intruders take time to pull themselves out of a submerged tunnel, the guards have time to recover. Otherwise, a party may potentially overwhelm them before they can act. When encountering intruders, one guard will rush into the habitat to raise the alarm, while the remaining guard or guards stay to engage in melee. Roll on the humanoids level 1 table to determine race of humanoid for the room and for the habitat beyond.

Obstructions clutter the passageway with tangles of wooden beams, piles of stones or stacked gabions (baskets filled with earth or stone) and fascines (bundles of sticks or rods tied together). These can be traversed, but doing so requires 10 action points (AP), however many combat rounds it takes. During this time, the character cannot engage in any other actions. As with the 'guardroom', roll to determine the race of the humanoid for this area and beyond.

Passages are genuinely undefended; note that "trapped" passages occur elsewhere. Although this may unnerve the party, it's evident that the dwellers have been undisturbed for so long that they no longer expend energy to watch over this part of their habitat.

Portucullises are heavy structures, typically made of wooden beams 2½ inches thick, with spaces 4¼ inches wide, providing cover equivalent to +3 AC. The gate can be lifted with the combined effort of up to three characters whose total combined strength is 42 or higher (count each 10% strength percentile as 1 point, so that 18/00 equals 28 points). This process takes three rounds, and the portcullis must be supported with a spike, strong beam or another comparable means to remain open. This gives plenty of time for the fleeing guard to raise the alarm. As with the 'guardroom', roll to determine the race of the humanoid for this area and beyond.

Reinforced doors are dungeon doors, each equipped with an iron peg on the far side that locks into the floor when closed, securing the door shut. Each door weighs 347 lbs. If the guards are surprised, they can be killed or the doors blocked before they can be closed. If the guards gain the initiative, they'll need 6 action points to fully shut the doors. This can be prevented by holding the door and successfully rolling to overbear, though the weight of the door counts in favour of the defenders. There is only enough time to observe that a passage lies beyond the doors, but no further details can be discerned. As with the guardroom, roll to determine the race of the humanoid for this area and beyond.

Traps within the lair consist solely of devices that residents can safely avoid while moving in and out. Characters with the knowledge to see simple traps can navigate around them effortlessly but cannot impart this skill to others. In certain instances, they may possess the ability to trigger the trap without sustaining harm, contingent upon the trap's design and their ingenuity.

Watch beasts are trained to react aggressively to strangers and cannot be negotiated with, nor swayed by offers of food or other distractions. During each round of combat against a watch beast, there is a 1 in 4 chance of the battle being heard. If a successful roll occurs, two archers will arrive on the third round thereafter and lend support to the beast. If the watch beast is slain before the archers arrive, they'll unleash two missiles before hastily retreating.

Space Beyond Obstruction Is

For these situations where the passage is initially blocked and soldiers are in a position to give warning — a guardroom, obstruction, portcullis or reinforced doors — whether they succeed in doing or not, the following table is used to determine what lays behind the obstruction.

Space Beyond Obstruction

Roll	Result
01-06	Short passage; shows a 15 ft. passage leading to an open portal located obliquely on the left or right hand side of the passage ending.
07-38	Long passage; shows a 20 ft. passage with a solid dungeon door located at the passage ending, on the left, right or middle.
39-81	Sunken room; irregular wide steps, 7-10 ft. long, descend into a 25 ft. diameter room, 4-6 foot below the level of the obstruction. Features 2 exits.
82-90	Gathering hall; 15 ft. wide, 30 ft. Features 2-4 exits.

Short passages describe a straightforward situation; characters entering the passage may approach the portal safely 90% of the time, so long as they're careful and use hand signals. If no effort is made by the players to keep quiet while sharing information with one another, then the occupants of the common room beyond (the guard that gave warning and any dependents who can hold a weapon) will rush out and potentially surprise the party; otherwise, they'll hold their ground and wait to be met.

Long passages are just a bit longer; the door is barred against the outside and must be broken in, which can be accomplished by wood axe over the space of 12 to 15 person-rounds. Two characters may work on the door at the same time. Once ten rounds of damage have been done, the axe-users can sighted with a bow or crossbow, though as defenders they receive a +4 AC bonus from cover still offered by the door.

Sunken rooms have irregular steps lading down over rough-hewn stone, with erratic widths varying from 18 to 30 inches wide and only about 6 in. high. The chamber is unlit, with metal wall sconces that are fixed to the walls by rivets. Exits may be anywhere along the walls, but must be at least three hexes apart. Each exit will be an ordinary door (1-14) or an opening leading to a 15 ft. passage, the end of which turns left or right out of sight. No one is present. The doors are not barred, and are flimsy enough that they can be kicked in with a strength check, which can be attempted each round.

There's a 50% chance that once the room is entered, a group whose size equals that of the party plus 1, including any guard who previously went to give the alarm; 1 in 4 of this group will be a non-combatant. There's a 50% chance that it will include a leader that is a levelled character.

Gathering halls are large spaces allowing the assembly of large groups, perhaps to organise a raid outside the dungeon. Exits may be anywhere along the walls, but must be at least two hexes apart. Each exit will be a dungeon door (1-8) or an ordinary door (9-20). None are barred. There is a 20% chance that two archers will have placed themselves at a door at the far end of the hall, near an open dungeon door; they'll open fire once the characters have shown themselves, either by opening the door or reaching the entrance to the hall, and run after their opening volley.

Monster Tables

Humanoids Level 1

Roll	Monster	Warriors	Depen-dents	Weapons
01	Bugbear	1	0	godentag (1-10 damage +1 for strength)
02	Cavewight	1	0	spear (1-8 damage +3 for strength)
03-06	Dwarf	4-14 (2d6+2)	6-21 (5d4+1)	battle axe (1-10), military pick (11) or short sword & spear (12-20); archers use light crossbows.
07-08	Elf	3-11 (1d8+3)	4-15 (1d12+3)	long sword (1-6), short sword & spear (7-12) or spear (13-20); archers use long (1-8) or short bows (09-20).
09-10	Gnoll	1-2	1-2	glaive; archers use "great bows," a brief description of which can be found with the bows.
11-13	Gnome	5-15 (2d6+3)	7-21 (2d8+5)	club & spear (1-7) or short sword & spear (8-20); archers use short bows.
14-22	Goblin	6-15 (3d4+3)	10-24 (2d8+8)	godentag (1-8) or spear (9-20); archers use short bows.
23-25	Halfling	6-16 (2d6+4)	7-22 (3d6+4)	hand axe (1-10) or spear (11-20); archers use short bows.
26-34	Hobgoblin	2-8	3-10 (d8+2)	godentag (1-8), spear (9-12); archers use long bows.
35-46	Human	5-15	8-23 (5d4+3)	battle axe (1-3), club (4-10), short sword (11-16) or spear (17-20); archers use light crossbows.
47-56	Kobald	6-18 (4d4+2)	7-22 (5d4+2)	godentag (1-12), hand axe (13-20); "archers" are armed with two javelins & a dagger.
57-75	Levelled Character	1	0	variable.
76-95	Orc	7-12 (d6+6)	9-16 (d8+8)	battle axe (1-8), godentag (9-14), long sword (15) or spear (16-20); archers use either light crossbows (1-10) or short bows (11-20).
09-10	Troglydyte	1-2	1-2	mace; "archers" are armed with two javelins & a stone club.
09-10	Wererat	1	0	short bow & short sword.

To determine the experience level of characters who possess that distinction, roll a 50% chance progressively until failing. For example, Linn the fighter is 1st level; she rolls and succeeds, becoming 2nd; she succeeds again and becomes 3rd; then she fails at becoming 4th, setting her level at 3rd. Roll gender of warriors and dependents randomly. The highest level character in a clan is counted as leader, with commensurate benefits, with that having the highest charisma chosen among those at the same level.

Dependents consist of adult workers and elders, whose number is determined using the "warrior" column, limited by the maximum dependents already determined; these have h.p. according to their hit dice. Remaining dependents are children aged 0 to 14, whose h.p. equals the humanoid's normal hit die halved (fractions discarded) with a -2 modifier. Those with less than 1 point are too young to engage in combat; hit points for the remainder reflect their age and relative robustness; note that with some creatures, such as troglodytes, even the youngest can have a meaningful number of hit points.

Wealth is determined by consulting the treasure table.

Bugbears or Cavewights encountered at this level are recluses. Double the widths and heights of all passages. Results that may have indicated a guardroom, portcullis or reinforced doors are discarded if this result occurs; replace with a roughly dug-out stone cave with a 25-foot diameter. Present are piled furs serving as a bed, a large block for sitting and a barrel or found crate used for holding roots, fruits and chunks of rotting meat. Adjacent to these provisions, add a pile of bones beside a stinking heap of garbage. The bugbear may be absent 20% of the time. Additionally, there is a 10% chance that a crude wooden cage or pen contains 0-3 human captives. Dungeon ends unless a 10% chance permits an opening leading to an alternate dungeon wing.

Dwarves will give quarter to intruders before engaging in combat and are willing to trade goods, especially mineral ores for food or iron tools; see bartering. Every sixth dwarf is a levelled cleric (1-5), fighter (6-17) or thief (18-20). Clerics use a godentag; thieves, a short sword.

Elves will give quarter to intruders before engaging in combat but are bound to be standoffish even to other elves or half-elves. With a charisma check made by the character with the highest number, they're willing to provide details and guidance regarding the lands within 40 miles. Every fifth elf is a levelled cleric (1-4), fighter (5-13), mage (14-17), ranger (18) or thief (19-20). Clerics use a quarterstaff; mages, a dagger; thieves, a short sword.

Gnolls are few in number; if there is but one, that warrior will hold his or her ground and not seek to raise an alarm. Any dependents who are capable of fighting will come when called, although they lack training and have a morale of 9.

Gnomes will give quarter to intruders, especially other gnomes, anxiously seeking news from the outside, and are anxious to make the gift of a metal tool of some kind, limited to 10 g.p. in value. Every sixth gnome is a levelled cleric (1-5), fighter (6-16), illusionist (17) or thief (18-20). Clerics use a club; illusionists, a dagger; thieves, a short sword.

Goblins attack at the first opportunity. Every eighth goblin is a levelled cleric (1-2), fighter (3-17) or mage (18-20). Spellcasters have limited spell use. Clerics use a godentag; mages, a club.

Halflings will give quarter to intruders, while begrudgingly offering 3 lb. of vittles per person, plus a pint of ale or wine. Every 7th halfling is a levelled druid (1), fighter (2-16) or thief (17-20). Druids use a spear; thieves, a dagger.

Hobgoblins attack at the first opportunity. Every sixth hobgoblin is a levelled cleric (1-3), fighter (4-16) or mage (17-20). Spellcasters have limited spell use. Clerics use a godentag; mages, a dagger.

Humans are outlaws, largely preying upon nearby civilised regions; they have an equal chance of attacking at the first opportunity and offering quarter to intruders. They're interested in training coin for tools and weapons. Every eighth human is a levelled cleric (1-3), fighter (4-15), mage (16) or thief (17-20). Clerics use maces; mages, a dagger; thieves, a short sword.

Kobalds attack at the first opportunity. Every ninth kobald is a levelled cleric (1), fighter (2-18) or mage (19-20). Spellcasters have limited spell use. Clerics use a godentag; mages, a dagger.

Levelled characters are ready companions that are EITHER randomly placed into the generative system in place of humanoids at the tunnel dungeon entrance or the Tunnel Dungeon (RDG)#Initial Space Behind Entrance|initial space behind entrance]], where they can be met and thus join the party (with the actual inhabitants of the tunnels being generated later), OR, as a prisoner of the inhabitants of the tunnels. This will be more fully explained later. Once indicated, the character should be rolled up and may be added to the existing party. Once the party consists of a maximum number chosen by the system user, this result can be ignored until it is needed. The class can be determined upon generation, or pre-determined (for this table) as a cleric (1-3), druid (4), fighter (5-12), mage (13-16), paladin (17), ranger (18) or thief (19-20), with stats rolled or adjusted until minimums are met.

Orcs attack at the first opportunity. Every seventh orc is a levelled cleric (1-5), fighter (6-17) or thief (18-20). Clerics have limited spell use. Clerics use a godentag; thieves, a short sword.

Troglodytes attack at the first opportunity. They do not have levelled characters among their number, being under-civilised and barely able to communicate with each other.

Wererats are also members of a specific humanoid race who are afflicted with that strain of lycanthropy; therefore, another roll is needed to determine which other race the wererat is a member of. It is up to the system user if this includes the levelled character result, which would permit the wererat to join the game party. Further, it should be decided if the wererat's lycanthropy is known to others of his or her humanoid race. It can be assumed that there's a 50% chance that the wererat is 1st level, with a roll made to determine if he or she is above 1st. Wererats can be any class that race permits. Troglodytes can be wererats, but then the wererat couldn't be levelled. There is a 75% chance that the wererat is the clan leader regardless of having an experience level, by dint of having 3+1 HD, as well as immunities, that would make the wererat largely invulnerable to attacks by others in the clan. Some wererats, however, choose not to lead, not because they're unable, but because they see opportunities in remaining apart. The placement of the wererat among his or her peers should be rolled randomly.