TEXT: Result
  effect, acid
  effect, charm
  effect, cold
  effect, confusion
  effect, curse
  effect, fear
  effect, ﬁre
  effect, hold
  effect, paralysis
  effect, poison
  effect, sleep
  effect, sleep
  effect, teleport
  effect, turn-to-stone
  servant demi-humans
  servant humanoids
  servant humans
  servant monster(s)
  summoned demi-humans
  summoned humanoids
  summoned humans
  summoned monster(s)
  trap, blades
  trap, pit(s)
  trap, snare
  trap, spikes
  trap, stones
  trick, illusion
  trick, puzzle
  trick, riddle
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  ENT3: PROTECTED BY...
  Result
  animus
  anxiety
  apprehension
  bleakness
  desolation
  destiny
  devastation
  disaster
  disequilibrium
  distrust
  doom
  emptiness
  enmity
  evil
  exhaustion
  fatigue
  foreboding
  frailty
  gloom
  instability
  loneliness
  malice
  powerlessness
  sorrow
  suspicion
  unbalance
  uncertainty
  unease
  vulnerability
  weakness
   Roll     
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  ENT4: SENSE OF...
  Result
  passage into ground (exposed/open entrance)
  open area in ground (“sunken open room”)
  stone platform built up from ground
  crypt/tomb (stone structure) w/ stone panel door
  crypt/tomb (stone structure) w/ iron door
  crypt/tomb (stone structure) w/ hidden/secret door
  grave (stone sarcophagus in ground)
  obelisk w/ standard door on side face
  obelisk w/ hidden/secret door on side face
  obelisk w/ hidden/secret door under tip/cap
  statue, small (must be moved)
  statue, medium (must be moved)
  statue, large, w/ stone panel door in base
  statue, large, w/ iron door in base
  statue, large, w/ hidden/secret door in base
  tree, large/hollow, with natural opening
  tree, large/hollow, with wood door
  tree, large/hollow/petriﬁed, with irondoor
  opening directly into face of natural rock formation
  stone panel set on face of natural rock formation
  iron door set on face of natural rock formation
  stone panel in ground, apparent/obvious
  stone panel in ground, covered with brush/foliage
  iron door in ground, apparent/obvious
  iron door in ground, covered with brush/foliage
  well, empty
  well, partially-ﬁlled (entrance above waterline)
  well, ﬁlled (entrance below waterline)
  labyrinth (entrance inside labyrinth)
  illusory terrain
   Roll     
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  ENT2: ACCESSED THROUGH...
  Result
  stairwell, 5' wide, 25° incline (long/shallow stairs)
  stairwell, 5' wide, 35° incline (average stairs)
  stairwell, 5' wide, 45° incline (short/steep stairs)
  stairwell, 10' wide, 25° incline (long/shallow stairs)
  stairwell, 10' wide, 35° incline (average stairs)
  stairwell, 10' wide, 45° incline (short/steep stairs)
  stairwell, 20' wide, 25° incline (long/shallow stairs)
  stairwell, 20' wide, 35° incline (average stairs)
  stairwell, 20' wide, 45° incline (short/steep stairs)
  stairwell, circular, 5' wide, short/steep stairs 
  sloping passage, 5' wide, 25° incline (shallow)
  sloping passage, 5' wide, 35° incline (average)
  sloping passage, 5' wide, 45° incline (steep)
  sloping passage, 10' wide, 25° incline (shallow)
  sloping passage, 10' wide, 35° incline (average)
  sloping passage, 10' wide, 45° incline (steep)
  sloping passage, 20' wide, 25° incline (shallow)
  sloping passage, 20' wide, 35° incline (average)
  sloping passage, 20' wide, 45° incline (steep)
  ladder down, wood, structurally sound
  ladder down, wood, structurally unsound (poorly built)
  ladder down, wood, rotting
  ladder down, iron, pristine condition
  ladder down, iron, rusted
  direct opening downward (no ladder), 3'x3' opening
  direct opening downward (no ladder), 5'x5' opening
  direct opening downward (no ladder), 10'x10' opening
  tube/slide
  elevator platform
  transdimensional portal (teleportation)
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  ENT1: ENTRANCE TYPE
  “d30 Underground Entrances”: © 2014, New Big Dragon Games Unlimited
  d30 Underground Entrances
  
SOURCE: textdata/thevault/OSR Generic/Old School Adventures D30 Accessories (OSR)/NBD d30 Encounters; Generators/d30 Underground Entrances (OSR).pdf