Underground Random Encounters CR 4
| d100 | Total CR | Name | Numbers | CR | Type | Size | Book |
| 1-2 | 4 | Aballin | 1 | 4 | Ooze | Large | Monsters of Faerûn |
| 3-4 | 4 | Ascomoid | 1 | 4 | Plant | Medium | Dungeonscape |
| 5-6 | 4 | Baneguard | 2 | 2 | Undead | Medium | Lost Empires of Faerûn |
| 7-8 | 4 | Baphitaur | 2 | 2 | Outsider | Medium | Underdark |
| 9-10 | 4 | Blooded One Orc | 4 | 1 | Humanoid | Medium | Unapproachable East |
| 11-12 | 4 | Bloodhulk Fighter | 1 | 4 | Undead | Medium | MM4 |
| 13-14 | 4 | Bonebat | 2 | 2 | Undead | Medium | Monsters of Faerûn |
| 15-16 | 4 | Brain in a jar | 1 | 4 | Undead | Tiny | Libris Mortis |
| 17-18 | 4 | Carrion Crawler | 1 | 4 | Aberration | Large | MM1 |
| 19-20 | 4 | Cave Fisher | 2 | 2 | Vermin | Medium | Dragon #355 |
| 21-22 | 4 | Centipede Swarm | 1 | 4 | Vermin | Diminutive | MM1 |
| 23-24 | 4 | Changeling, 1st-Level Warrior | 11 | 1/2 | Humanoid | Medium | MM3 |
| 25-26 | 4 | Chitine | 5 | 1 | Humanoid | Small | Monsters of Faerûn |
| 27-28 | 4 | Clay Half-Golem | 1 | 4 | Construct | Medium | MM2 |
| 29-30 | 4 | Clockroach | 5 | 1 | Construct | Small | MM4 |
| 31-32 | 4 | Copper Horror | 2 | 2 | Construct | Small | Dragon #350 |
| 33-34 | 4 | Corpse Rat Swarm | 1 | 4 | Undead | Tiny | Libris Mortis |
| 35-36 | 4 | Crawling Claw | 2 | 2 | Construct | Tiny | Lost Empires of Faerûn |
| 37-38 | 4 | Crested Felldrake | 5 | 1 | Dragon | Small | MM2 |
| 39-40 | 4 | Dark Stalker | 1 | 4 | Humanoid | Medium | Fiend Folio |
| 41-42 | 4 | Darkmantle | 5 | 1 | Magical Beast | Small | MM1 |
| 43-44 | 4 | Deep Hound | 1 | 4 | Magical Beast | Large | Races of Stone |
| 45-46 | 4 | Dekanter Goblin | 5 | 1 | Humanoid | Medium | Monsters of Faerûn |
| 47-48 | 4 | Desiccator | 2 | 2 | Undead | Small | Libris Mortis |
| 49-50 | 4 | Dire Maggot | 2 | 2 | Vermin | Small | Libris Mortis |
| 51-52 | 4 | Dire Rat | 16 | 1/3 | Animal | Small | MM1 |
| 53-54 | 4 | Dire Rat Skeleton | 16 | 1/3 | Undead | Small | Libris Mortis |
| 55-56 | 4 | Dire Rat Zombie | 11 | 1/2 | Undead | Small | Libris Mortis |
| 57-58 | 4 | Dragonflesh Half-Golem | 1 | 4 | Construct | Medium | MM2 |
| 59-60 | 4 | Dread | 2 | 2 | Undead | Small | Lost Empires of Faerûn |
| 61-62 | 4 | Dread Guard | 2 | 2 | Construct | Medium | MM2 |
| 63 | 4 | Drow Werebat | 1 | 4 | Humanoid | Medium | Lost Empires of Faerûn |
| 64 | 4 | Eunuch Clockwork | 1 | 4 | Construct | Medium | Dragon #334 |
| 65 | 4 | Fetid Fungus | 4 | 1 | Plant | Medium | MM5 |
| 66 | 4 | Fey’ri | 2 | 2 | Outsider | Medium | Monsters of Faerûn |
| 67 | 4 | Flameskull | 1 | 4 | Undead | Tiny | Lost Empires of Faerûn |
| 68 | 4 | Flesh Half-Golem | 1 | 4 | Construct | Medium | MM2 |
| 69 | 4 | Fleshvigor Ghoul | 2 | 2 | Undead | Medium | Dragon #315 |
| 70 | 4 | Footpad Lizard | 1 | 4 | Animal | Large | Drow of the Underdark |
| 71 | 4 | Force Golem | 1 | 4 | Construct | Large | MM5 |
| 72 | 4 | Gargoyle | 1 | 4 | Humanoid | Medium | MM1 |
| 73 | 4 | Gargoyle Kir-Lanan | 2 | 2 | Humanoid | Medium | Forgotten Realms Campaign Setting |
| 74 | 4 | Gauntlet Guardian | 1 | 4 | Construct | Small | Complete Warrior |
| 75 | 4 | Ghoul | 4 | 1 | Undead | Medium | MM1 |
| 76 | 4 | Giant Maggot | 11 | 1/2 | Vermin | Small | Underdark |
| 77 | 4 | Giant Sun Spider | 2 | 2 | Vermin | Large | Lost Empires of Faerûn |
| 78 | 4 | Giant Whip Scorpion | 2 | 2 | Vermin | Large | Lost Empires of Faerûn |
| 79 | 4 | Giant Whip Spider | 5 | 1 | Vermin | Medium | Lost Empires of Faerûn |
| 80 | 4 | Gnome Warrior Zombie | 11 | 1/2 | Undead | Small | Libris Mortis |
| 81 | 4 | Grandfather Plaque | 1 | 4 | Construct | Small | Dragon Compendium - Volume I |
| 82 | 4 | Green Warder | 1 | 4 | Plant | Medium | Monsters of Faerûn |
| 83 | 4 | Grimlock | 4 | 1 | Humanoid | Medium | MM1 |
| 84 | 4 | Groundling | 2 | 2 | Humanoid | Medium | Monsters of Faerûn |
| 85 | 4 | Guardgoyle | 2 | 2 | Construct | Small | Waterdeep |
| 86 | 4 | Hairy Spider | 11 | 1/2 | Vermin | Fine | Monsters of Faerûn |
| 87 | 4 | Half-Fiend Durzagon | 1 | 4 | Outsider | Medium | MM2 |
| 88 | 4 | Half-illithid Lizardfolk | 1 | 4 | Aberration | Medium | Fiend Folio |
| 89 | 4 | Halfling Warrior Skeleton | 16 | 1/3 | Undead | Small | Libris Mortis |
| 90 | 4 | Hammerer | 1 | 4 | Construct | Medium | MM2 |
| 91 | 4 | Harpoon Spider | 1 | 4 | Aberration | Large | MM3 |
| 92 | 4 | Hatchling Phaerimm | 3 | 1 | Aberration | Tiny | Lost Empires of Faerûn |
| 93 | 4 | Hound Archon Zombie | 1 | 4 | Undead | Medium | Libris Mortis |
| 94 | 4 | Huge Monstrous Centipede | 2 | 2 | Vermin | Huge | MM1 |
| 95 | 4 | Human Commoner Zombie | 11 | 1/2 | Undead | Medium | MM1 |
| 96 | 4 | Human Warrior Skeleton | 16 | 1/3 | Undead | Medium | MM1 |
| 97 | 4 | Iron Half-Golem | 1 | 4 | Construct | Medium | MM2 |
| 98 | 4 | Ixzan | 1 | 4 | Aberration | Medium | Lost Empires of Faerûn |
| 99 | 4 | Large Monstrous Centipede | 5 | 1 | Vermin | Large | MM1 |
| 100 | 4 | Lesser Bonedrinker | 1 | 4 | Undead | Small | MM3 |
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