TEXT: d30 Ruins Generator
  “d30  Ruins Generator”: © 2012, New Big Dragon Games Unlimited
  RG1: TYPE OF RUIN
  1
  2
  3
  4
  5
  6
  7
  8
  9
  0
  10s
  hovel
  villa
  tower
  altar
  tomb
  crypt
  bunker
  hamlet
  small castle
  small city
  20s
  hut
  manor
  keep
  shrine
  vault
  catacombs
  blockhouse
  village
  med. castle
  med. city
  30s
  cottage
  palace
  citadel
  temple
  mausoleum
  sewer
  garrison
  town
  large caste
  large city
  RG3: INHABITANTS & NUMBER
  1
  2
  3
  4
  5
  6
  7
  8
  9
  0
  Type
  chimera
  humanoids*
  humans
  insects
  lycanthropes
  magical
  mammals
  molds/slimes/jellies
  reptiles/reptilians
  undead
  10s Digit: Number
   1-10 nuisance
   11-20  infested
   21-30  overrun
  * as appropriate to terrain type
  ** for desert terrains, use “burned/charred”
  * roll addition 1d3 
    [1=demi-human, 2=human-sized, 3=giant-class]
  SUGGESTED INHABITANTS BY TYPE AND GENERAL LEVEL
  1
  2
  3
  4
  5
  6
  7
  8
  9
  0
  Type
  chimera
  humanoids, small
  humanoids, medium
  humanoids, giant
  humans
  insects
  lycanthropes
  magical/misc.
  mammals
  molds/slimes/jellies
  reptiles/reptilians
  undead
  1
  2
  3
  4
  5
  6
  7
  8
  9
  10
  11
  12
  13
  14
  15
  ...harpies, centaurs, minotaurs, medusae, satyrs, cockatrices, manticores, lammasus, lamias, chimerae, sphinxes
  kobolds, goblins
  orcs, hobgoblins, gnolls, lizard men, troglodytes
  ...bugbears...         ...ogres, ogre magi, trolls... 
  ...hill giants, stone giants, frost giants, ﬁre giants, cyclopses, cloud giants, storm giants
  by level...
  giant: centipedes, ants, beetles, spiders, wasps, scorpions
  stirges, gargoyles living statues, blink dogs, basilisks, rust monsters, invisible stalkers, rakshasa, salamanders, djinn, efreet, ropers, giant slugs, purple worms
  giant shrews, wolves, dire wolves, giant skunks, giant porcupines
  yellow mold, green slime, gray ooze, gelatinous cube, ochre jelly... 
  ...black puddings
  spitting cobras, pit vipers, giant rattlers, rock pythons, giant lizards, hydras, wyverns, nagas, dragons (white, black, green, blue, red, gold)  
  skeletons, zombies, ghouls, wights, wraiths, mummies, spectres, vampires...                   ....ghosts...
  ...lich(es)
  10s Digit: Degree
   1-10 slightly/
   
   
  barely
   11-20  moderately/
   
   
  noticeably
   21-30  severely/
   
   
  extremely
  1s Digit: Type of Ruin/Decay
  1
   2
   3
   4
   5
   6
   7
   8
   9
   0
  burned/charred
  collapsed/crumbling
  covered in vines/sand/rocks*
  disﬁgured/destroyed
  moldy/contaminated**
  sunken
  burned/charred & disﬁgured/destroyed
  covered in vines/sand/rocks & moldy/contaminated
  sunken & covered in vines/sand/rocks
  sunken & collapsed/crumbling & covered
  RG2: TYPE OF RUIN/DECAY & DEGREE
  ...wererats, werewolves, wereboars, weretigers, werebears, devil swines
  
SOURCE: textdata/thevault/OSR Generic/Old School Adventures D30 Accessories (OSR)/NBD d30 Encounters; Generators/d30 Ruins Generator (OSR).pdf