TEXT: COMMON
  Monster 
  #W 
  #L 
  @L
  beetles, giant bomb. 1-6 
  3-12 
  —
  beetles, giant boring 1-5 
  3-18 
  12
  beetles, giant ﬁre 
  1-8 
  2-12 
  —
  beetles, giant stag 
  1-5 
  2-12 
  —
  boars, wild 
  1-3 
  1-12 
  3
  buffalo, water 
  1-3 
  1-15 
  —
  centipedes, giant 
  2-8 
  2-24 
  1
  crocodiles, normal 
  1-8 
  3-24 
  —
  dogs, wild 
  1-4 
  4-16 
  5
  fungi* 
  1 
  1-3 
  —
  insect swarm 
  1 
  1-3 
  —
  lizards, giant 
  1-6 
  2-12 
  —
  mold* 
  1 
  1-3 
  —
  nutrias 
  3-18 3-30 
  3
  nutrias, giant 
  1-6 
  2-12 
  5
  ogres 
  1-6 
  2-12 
  6
  orcs 
  2-8 
  2-60 10
  mastodons 
  1-3 
  1-12 
  — 
  rats, normal 
  2-20 5-50 
  6
  rats, giant 
  3-18 3-30 
  3
  ravens, normal 
  1-8 
  4-32 
  9
  ravens, giant 
  1-4 
  4-16 
  6
  rhinoceroses 
  1-3 
  1-6 
  —
  snakes, constrict. 
  1-3 
  1-8 
  —
  snakes, poison. 
  1-3 
  1-6 
  —
  spiders, large 
  1-3 
  2-20 
  18
  toads, giant 
  1-3 
  1-12 
  —
  turtles, giant snap. 
  1 
  1-4 
  —
  vultures, normal 
  1-4 
  2-8 
  —
  wolves 
  1-5 
  2-20 
  3
   Roll     
  1
  2
  3
  4
  5
  6
  7
  8
  9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  UNCOMMON
  Monster 
  #W 
  #L 
  @L
  axebeaks 
  1-3 
  1-6 
  —
  badgers 
  1-2 
  2-5 
  —
  bandits (T/1)  
  2-5 
  3-30 
  6
  basilisks 
  1-2 
  1-4 
  12
  cockatrices 
  1-2 
  1-6 
  9
  crocodiles, giant 
  1-3 
  2-12 
  —
  falcons, normal 
  1 
  1-2 
  4
  frogs, giant 
  1-4 
  5-40 
  —
  ghouls 
  1-6 
  2-16 
  6
  gnolls 
  1-6 
  3-18 
  6
  hobgoblins 
  1-6 
  4-24 
  7
  hornets, giant 
  1 
  1-3 
  3
  hydras 
  1 
  1 
  6
  irish deer 
  1-2 
  1-8 
  —
  leeches, giant 
  1-4 
  4-16 
  —
  lizards, g. draco 
  1-4 
  1-8 
  9
  lizards, g. gecko 
  1-6 
  1-10 
  6
  lizards, g. h. cham. 
  1-3 
  1-6 
  9
  lizards, g. tuatara 
  1-2 
  1-4 
  9
  lycans., wererats 
  1-8 
  2-16 
  9
  neandrethals 
  1-10 10-40 12
  scorpions, giant 
  1 
  1-4 
  15
  snakes, g. constr. 
  1 
  1-2 
  —
  snakes, g. poison. 
  1 
  1-3 
  —
  stirges 
  1-6 
  3-30 18
  toads, poisonous 
  1-4 
  1-8 
  —
  trolls 
  1-4 
  1-8 
  12
  wasps, giant 
  1-6 
  5-30 
  —
  will-o-wisps 
  1 
  1-3 
  2
  wyverns 
  1-2 
  1-6 
  9
   Roll     
  1
  2
  3
  4
  5
  6
  7
  8
  9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  RARE
  Monster 
  #W 
  #L 
  @L
  badgers, giant 
  1 
  1-3 
  —
  baluchitherium 
  1 
  1-3 
  —
  beavers, giant 
  1-4 10-40 24
  dinosaurs 
  * 
  * 
  *
  dragonﬂies, giant 
  1-6 
  4-24 
  —
  falcons, giant 
  1 
  1-4 
  3
  frogmen 
  1-10 10-80 6
  fungi, violet 
  1 
  1-4 
  —
  ghasts 
  1-2 
  1-6 
  6
  giants, hill 
  1-3 
  1-12 
  7
  goblins 
  2-8 
  6-60 12
  harpies 
  1-6 
  2-12 
  7
  jackals 
  1-3 
  1-6 
  — 
  1-2 
  1-6 
  lizard men 
  2-8 
  6-36 
  9
  lycans., werebears 
  1-2 
  1-4 
  3
  lycans., wereboars 
  1-6 
  2-12 
  6
  medusae 
  1-3 
  1-4 
  15
  minotaurs 
  1-4 
  1-8 
  6
  owlbears 
  1-2 
  1-4 
  9
  shadows 
  1-4 
  2-20 
  12
  shambling mounds 
  1 
  1-3 
  9
  skeletons 
  3-12 3-30 
  3
  skunks, giant 
  1 
  1-3 
  3
  spectres 
  1 
  1-6 
  3
  spiders, phase 
  1 
  1-4 
  22
  trolls, giant 
  1-4 
  2-12 
  12
  vapor rats 
  1-4 
  2-16 
  9
  warthogs 
  1-2 
  1-6 
  3
  wolves, dire 
  1-4 
  3-12 
  3
  zombies 
  2-8 
  4-24 
  —
   Roll     
  1
  2
  3
  4
  5
  6
  7
  8
  9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  VERY RARE
  Monster 
  #W 
  #L 
  @L
  bats, giant 
  1-3 
  3-18 
  15
  beholding beast 
  1 
  1 
  24
  berserkers 
  1-6 
  3-30 
  3
  boars, giant 
  1-2 
  2-8 
  3
  catoblepases 
  1 
  1-3 
  —
  crayﬁsh, giant 
  1 
  1-4 
  —
  dopplegangers 
  1-4 
  3-12 
  6
  dragons, black 
  1 
  1-4 
  18
  dragons, gold 
  1 
  1-3 
  20
  dragons, green 
  1 
  1-4 
  18
  elves, wood 
  1-4 
  2-24 
  6
  ﬂies, giant 
  1-3 
  1-10 
  —
  gargoyles 
  1-4 
  1-8 
  6
  ghost 
  1 
  1 
  7
  gorgons 
  1 
  1-4 
  12
  groaning spirit 
  1 
  1 
  3
  haunt 
  1 
  1 
  —
  jackalweres 
  1-2 
  1-4 
  9
  kobolds 
  4-16 6-60 12
  lammasus 
  1-4 
  2-8 
  9
  manticores 
  1 
  1-4 
  6
  mummy 
  1 
  1 
  —
  nagas, spirit  
  1 
  1-3 
  18
  shedus 
  1-4 
  2-8 
  7
  sphinx, andro- 
  1 
  1 
  18
  termites, giant water 1 
  1-3 
  —
  ticks, giant 
  1-4 
  3-12 
  —
  treants 
  1-4 
  1-20 
  3
  water weirds 
  1 
  1-3 
  15
  wights 
  1-4 
  2-16 
  21
   Roll     
  1
  2
  3
  4
  5
  6
  7
  8
  9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  * non-subterranean type at DM’s discretion
  #W=no. appearing as wandering monsters   #L=no. appearing in lair   @L=chance-in-30 of encountering monster while in its lair
  Roll 1d30 [1-15=common; 16-25=uncommon; 26-29=rare; 30=very rare]
  “d30 Swamp Encounters”: © 2014, New Big Dragon Games Unlimited
  d30 Swamp Encounters
  
SOURCE: textdata/thevault/OSR Generic/Old School Adventures D30 Accessories (OSR)/NBD d30 Encounters; Generators/d30 Swamp Encounters (OSR).pdf