Underground Random Encounters CR 9
| d100 | Total CR | Name | Numbers | CR | Type | Size | Book |
| 1-2 | 9 | Aboleth | 2 | 7 | Aberration | Huge | MM1 |
| 3-4 | 9 | Anarchic Athach | 1 | 9 | Aberration | Huge | Manual of the Planes |
| 5-6 | 9 | Arachnoid Mouther | 3 | 6 | Aberration | Large | Underdark |
| 7-8 | 9 | Arcane Ooze | 1 | 9 | Ooze | Huge | MM3 |
| 9-10 | 9 | Beacon Moth | 5 | 5 | Magical Beast | Huge | Dragon #322 |
| 11-12 | 9 | Blood Amniote | 1 | 9 | Undead | Huge | Libris Mortis |
| 13-14 | 9 | Bloodmote Cloud | 3 | 6 | Undead | Fine | Libris Mortis |
| 15-16 | 9 | Boar Topiary Guardian | 8 | 3 | Plant | Medium | MM3 |
| 17-18 | 9 | Bone Rat Swarm | 11 | 3 | Undead | Tiny | Libris Mortis |
| 19-20 | 9 | Boneclaw | 4 | 5 | Undead | Large | MM3 |
| 21 | 9 | Bonedrinker | 3 | 6 | Undead | Medium | MM3 |
| 22 | 9 | Bonespitter | 11 | 3 | Undead | Medium | Dragon Compendium - Volume I |
| 23 | 9 | Brass Half-Golem | 5 | 5 | Construct | Medium | MM2 |
| 24 | 9 | Cave Ankylosaurus | 3 | 6 | Animal | Large | Miniatures Handbook |
| 25 | 9 | Cave Triceratop | 5 | 5 | Animal | Large | Miniatures Handbook |
| 26 | 9 | Cave Tyrannosaurus | 5 | 5 | Animal | Large | Miniatures Handbook |
| 27 | 9 | Centipede Swarm | 7 | 4 | Vermin | Diminutive | MM1 |
| 28 | 9 | Cesspit Ooze | 1 | 9 | Ooze | Large | Cityscape |
| 29 | 9 | Chimeric Ankheg | 1 | 9 | Magical Beast | Large | MM2 |
| 30 | 9 | Chwidencha | 1 | 9 | Aberration | Large | Drow of the Underdark |
| 31 | 9 | Cinderspawn | 3 | 6 | Undead | Large | Libris Mortis |
| 32 | 9 | Clay Half-Golem | 7 | 4 | Construct | Medium | MM2 |
| 33 | 9 | Cloaker | 5 | 5 | Aberration | Large | MM1 |
| 34 | 9 | Colossal Monstrous Centipede | 1 | 9 | Vermin | Colossal | MM1 |
| 35 | 9 | Corpse Rat Swarm | 7 | 4 | Undead | Tiny | Libris Mortis |
| 36 | 9 | Corrupture | 1 | 9 | Ooze | Huge | MM4 |
| 37 | 9 | Crypt Chanter | 2 | 7 | Undead | Medium | Libris Mortis |
| 38 | 9 | Crypt Spawn | 1 | 9 | Undead | Medium | Magic of Faerûn |
| 39 | 9 | Deadly Dancer | 8 | 3 | Aberration | Medium | Tome of Magic |
| 40 | 9 | Death Dog | 12 | 2 | Magical Beast | Medium | Fiend Folio |
| 41 | 9 | Deathlock | 9 | 3 | Undead | Medium | Libris Mortis |
| 42 | 9 | Deep Rothé | 15 | 2 | Magical Beast | Medium | Forgotten Realms Campaign Setting |
| 43 | 9 | Delver | 1 | 9 | Aberration | Huge | MM1 |
| 44 | 9 | Derro | 11 | 3 | Humanoid | Small | MM1 |
| 45 | 9 | Desmodu | 1 | 9 | Humanoid | Large | MM2 |
| 46 | 9 | Dire Lion Effigy | 3 | 6 | Construct | Large | Complete Arcane |
| 47 | 9 | Dire Toad | 11 | 3 | Animal | Medium | MM2 |
| 48 | 9 | Direguard | 10 | 3 | Undead | Medium | Lost Empires of Faerûn |
| 49 | 9 | Dragonflesh Half-Golem | 7 | 4 | Construct | Medium | MM2 |
| 50 | 9 | Dread Harpoon Spider | 1 | 9 | Aberration | Huge | MM3 |
| 51 | 9 | Drider | 2 | 7 | Aberration | Large | MM1 |
| 52 | 9 | Drow Priestess | 1 | 9 | Humanoid | Medium | MM4 |
| 53 | 9 | Drowned | 1 | 9 | Undead | Medium | MM3 |
| 54 | 9 | Dust Wight | 2 | 7 | Undead | Medium | MM3 |
| 55 | 9 | Electrum Horror | 7 | 4 | Construct | Small | MM2 |
| 56 | 9 | Embrac | 2 | 7 | Aberration | Large | Lords of Madness |
| 57 | 9 | Entomber | 4 | 5 | Undead | Medium | Libris Mortis |
| 58 | 9 | Eunuch Clockwork | 7 | 4 | Construct | Medium | Dragon #334 |
| 59 | 9 | Evolved Wraith | 3 | 6 | Undead | Medium | Libris Mortis |
| 60 | 9 | Faerzress-infused Minotaur | 4 | 5 | Humanoid | Large | Underdark |
| 61 | 9 | Fey’ri | 15 | 2 | Outsider | Medium | Monsters of Faerûn |
| 62 | 9 | Fire Spectre | 3 | 6 | Undead | Medium | Ghostwalk |
| 63 | 9 | Flameskull | 7 | 4 | Undead | Tiny | Lost Empires of Faerûn |
| 64 | 9 | Flesh Golem | 2 | 7 | Construct | Large | MM1 |
| 65 | 9 | Flesh Half-Golem | 7 | 4 | Construct | Medium | MM2 |
| 66 | 9 | Fleshvigor Ghoul | 12 | 2 | Undead | Medium | Dragon #315 |
| 67 | 9 | Forsaken Shell | 3 | 6 | Undead | Medium | Libris Mortis |
| 68 | 9 | Foulwing | 5 | 5 | Aberration | Huge | Lost Empires of Faerûn |
| 69 | 9 | Frost Salamander | 2 | 7 | Magical Beast | Medium | MM2 |
| 70 | 9 | Gargoyle | 7 | 4 | Humanoid | Medium | MM1 |
| 71 | 9 | Ghastly Hill Giant | 1 | 9 | Undead | Large | Dragon Compendium - Volume I |
| 72 | 9 | Ghost 5th-Level Human Fighter | 2 | 7 | Undead | Medium | MM1 |
| 73 | 9 | Ghoulish Harpy | 4 | 5 | Undead | Medium | Dragon Compendium - Volume I |
| 74 | 9 | Giant Cockroach | 15 | 2 | Vermin | Medium | Underdark |
| 75 | 9 | Giant Tick | 15 | 2 | Vermin | Small | Dragon #321 |
| 76 | 9 | Gravehound | 10 | 3 | Undead | Medium | Miniatures Handbook |
| 77 | 9 | Gravetouched Ghoul 6th-Level Human Monk | 2 | 7 | Undead | Medium | Libris Mortis |
| 78 | 9 | Gray Shiver | 1 | 9 | Magical Beast | Diminutive | Dragon #343 |
| 79 | 9 | Greathorn Minotaur | 2 | 7 | Humanoid | Large | MM4 |
| 80 | 9 | Guard Bat | 8 | 3 | Animal | Large | MM2 |
| 81 | 9 | Guardian Gorgon | 1 | 9 | Magical Beast | Large | Dungeonscape |
| 82 | 9 | Guttersnipe | 4 | 5 | Construct | Medium | MM2 |
| 83 | 9 | Half-illithid Lizardfolk | 7 | 4 | Aberration | Medium | Fiend Folio |
| 84 | 9 | Horned Felldrake | 11 | 3 | Dragon | Medium | MM2 |
| 85 | 9 | Hound Archon Zombie | 7 | 4 | Undead | Medium | Libris Mortis |
| 86 | 9 | Hound of the Gloom | 1 | 9 | Aberration | Large | Lords of Madness |
| 87 | 9 | Huecuva | 2 | 7 | Undead | Medium | Fiend Folio |
| 88 | 9 | Huge Husk Scorpion | 1 | 9 | Undead | Huge | Drow of the Underdark |
| 89 | 9 | Huge Taint Elemental | 1 | 9 | Elemental | Huge | Heroes of Horror |
| 90 | 9 | Hulking Corpse | 1 | 9 | Undead | Medium | Libris Mortis |
| 91 | 9 | Hunting Bat | 8 | 3 | Animal | Medium | MM2 |
| 92 | 9 | Ice Beast Gargoyle | 11 | 3 | Construct | Medium | Frostburn |
| 93 | 9 | Illithocyte | 15 | 2 | Aberration | Small | Dragon #337 |
| 94 | 9 | Ineffable Horror | 5 | 5 | Aberration | Large | Underdark |
| 95 | 9 | Iron Half-Golem | 7 | 4 | Construct | Medium | MM2 |
| 96 | 9 | Ironclad Mauler | 1 | 9 | Magical Beast | Large | MM3 |
| 97 | 9 | Ixzan | 7 | 4 | Aberration | Medium | Lost Empires of Faerûn |
| 98 | 9 | Juvenile Amethyst Dragon | 1 | 9 | Dragon | Large | MM2 |
| 99 | 9 | Juvenile Chromium Dragon | 1 | 9 | Dragon | Large | Dragon #356 |
| 100 | 9 | Juvenile Cobalt Dragon | 1 | 9 | Dragon | Medium | Dragon #356 |
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