Underground Random Encounters CR 3
| d100 | Total CR | Name | Numbers | CR | Type | Size | Book |
| 1 | 3 | Adamantine Spider | 1 | 3 | Construct | Small | Drow of the Underdark |
| 2 | 3 | Allip | 1 | 3 | Undead | Medium | MM1 |
| 3 | 3 | Blooded One Orc | 3 | 1 | Humanoid | Medium | Unapproachable East |
| 4 | 3 | Bluespawn Stoneglider | 1 | 3 | Humanoid | Medium | Dragons of Faerûn |
| 5 | 3 | Boar Topiary Guardian | 1 | 3 | Plant | Medium | MM3 |
| 6 | 3 | Boggle | 1 | 3 | Humanoid | Small | MM2 |
| 7 | 3 | Bone Rat Swarm | 1 | 3 | Undead | Tiny | Libris Mortis |
| 8 | 3 | Bonesinger | 1 | 3 | Undead | Medium | Ghostwalk |
| 9 | 3 | Bonespitter | 1 | 3 | Undead | Medium | Dragon Compendium - Volume I |
| 10 | 3 | Bonespur | 1 | 3 | Undead | Large | MM5 |
| 11 | 3 | Chameleon Bugbear | 1 | 3 | Humanoid | Medium | Underdark |
| 12 | 3 | Changeling Spy, 3rd-Level Rogue | 1 | 3 | Humanoid | Medium | MM3 |
| 13 | 3 | Chitine | 3 | 1 | Humanoid | Small | Monsters of Faerûn |
| 14 | 3 | Clockroach | 3 | 1 | Construct | Small | MM4 |
| 15 | 3 | Crested Felldrake | 3 | 1 | Dragon | Small | MM2 |
| 16 | 3 | Cursed Spirit | 1 | 3 | Undead | Medium | Miniatures Handbook |
| 17 | 3 | Dark Creeper | 1 | 3 | Humanoid | Small | Fiend Folio |
| 18 | 3 | Darkmantle | 3 | 1 | Magical Beast | Small | MM1 |
| 19 | 3 | Deadly Dancer | 1 | 3 | Aberration | Medium | Tome of Magic |
| 20 | 3 | Deathlock | 1 | 3 | Undead | Medium | Libris Mortis |
| 21 | 3 | Dekanter Goblin | 3 | 1 | Humanoid | Medium | Monsters of Faerûn |
| 22 | 3 | Dire Rat Zombie | 7 | 1/2 | Undead | Small | Libris Mortis |
| 23 | 3 | Dire Toad | 1 | 3 | Animal | Medium | MM2 |
| 24 | 3 | Direguard | 1 | 3 | Undead | Medium | Lost Empires of Faerûn |
| 25 | 3 | Doppelganger | 1 | 3 | Humanoid | Medium | MM1 |
| 26 | 3 | Dread Ram | 1 | 3 | Undead | Large | Ghostwalk |
| 27 | 3 | Ethereal Filcher | 1 | 3 | Aberration | Medium | MM1 |
| 28 | 3 | Fetid Fungus | 3 | 1 | Plant | Medium | MM5 |
| 29 | 3 | Fihyr | 1 | 3 | Aberration | Small | MM2 |
| 30 | 3 | Gelatinous Cube | 1 | 3 | Ooze | Large | MM1 |
| 31 | 3 | Ghast | 1 | 3 | Undead | Medium | MM1 |
| 32 | 3 | Ghosteater | 1 | 3 | Aberration | Medium | Ghostwalk |
| 33 | 3 | Ghoul | 3 | 1 | Undead | Medium | MM1 |
| 34 | 3 | Giant Maggot | 7 | 1/2 | Vermin | Small | Underdark |
| 35 | 3 | Giant Whip Spider | 3 | 1 | Vermin | Medium | Lost Empires of Faerûn |
| 36 | 3 | Gravehound | 1 | 3 | Undead | Medium | Miniatures Handbook |
| 37 | 3 | Grell | 1 | 3 | Aberration | Medium | MM2 |
| 38 | 3 | Grick | 1 | 3 | Aberration | Medium | MM1 |
| 39 | 3 | Grimlock | 3 | 1 | Humanoid | Medium | MM1 |
| 40 | 3 | Guard Bat | 1 | 3 | Animal | Large | MM2 |
| 41 | 3 | Hairy Spider | 7 | 1/2 | Vermin | Fine | Monsters of Faerûn |
| 42 | 3 | Hatchling Phaerimm | 2 | 1 | Aberration | Tiny | Lost Empires of Faerûn |
| 43 | 3 | Horned Felldrake | 1 | 3 | Dragon | Medium | MM2 |
| 44 | 3 | Hunting Bat | 1 | 3 | Animal | Medium | MM2 |
| 45 | 3 | Ice Beast Gargoyle | 1 | 3 | Construct | Medium | Frostburn |
| 46 | 3 | Inquisitor | 1 | 3 | Undead | Medium | Dragon #352 |
| 47 | 3 | Large Acidborn Shark | 1 | 3 | Magical Beast | Large | Dungeonscape |
| 48 | 3 | Large Animate Object | 1 | 3 | Construct | Large | MM1 |
| 49 | 3 | Large Monstrous Centipede | 3 | 1 | Vermin | Large | MM1 |
| 50 | 3 | Lolth-Touched Monstrous Hunting Spider | 1 | 3 | Vermin | Large | MM4 |
| 51 | 3 | Lurker | 1 | 3 | Aberration | Large | Underdark |
| 52 | 3 | Mindshredder Larva | 3 | 1 | Aberration | Small | MM3 |
| 53 | 3 | Minotaur Skeleton | 1 | 3 | Undead | Large | Libris Mortis |
| 54 | 3 | Murk | 1 | 3 | Undead | Medium | Libris Mortis |
| 55 | 3 | Myconid Average Worker | 3 | 1 | Plant | Small | MM2 |
| 56 | 3 | Necroplasm | 1 | 3 | Undead | Medium | Ghostwalk |
| 57 | 3 | Necrosis Carnex | 1 | 3 | Undead | Medium | MM4 |
| 58 | 3 | Night Hunter | 3 | 1 | Magical Beast | Medium | Monsters of Faerûn |
| 59 | 3 | Norker | 7 | 1/2 | Humanoid | Small | Dragon #343 |
| 60 | 3 | Nothic | 1 | 3 | Aberration | Medium | Miniatures Handbook |
| 61 | 3 | Pack Lizard | 1 | 3 | Animal | Large | Forgotten Realms Campaign Setting |
| 62 | 3 | Phaerlin Giant | 1 | 3 | Giant | Huge | Monsters of Faerûn |
| 63 | 3 | Phantom Fungus | 1 | 3 | Plant | Medium | MM1 |
| 64 | 3 | Plague Walker | 1 | 3 | Undead | Medium | MM4 |
| 65 | 3 | Quaggoth | 1 | 3 | Humanoid | Medium | Monsters of Faerûn |
| 66 | 3 | Quell | 1 | 3 | Undead | Medium | Libris Mortis |
| 67 | 3 | Roving Mauler | 1 | 3 | Magical Beast | Medium | Tome of Magic |
| 68 | 3 | Rust Monster | 1 | 3 | Aberration | Medium | MM1 |
| 69 | 3 | Rylkar Madclaw | 1 | 3 | Magical Beast | Small | MM5 |
| 70 | 3 | Saltor | 1 | 3 | Aberration | Small | Lords of Madness |
| 71 | 3 | Shadow | 1 | 3 | Undead | Medium | MM1 |
| 72 | 3 | Shadow Asp | 3 | 1 | Magical Beast | Tiny | Fiend Folio |
| 73 | 3 | Shimmerwing | 1 | 3 | Magical Beast | Tiny | Dragon #357 |
| 74 | 3 | Shrieker | 3 | 1 | Plant | Medium | MM1 |
| 75 | 3 | Shyft | 3 | 1 | Outsider | Medium | Fiend Folio |
| 76 | 3 | Skum Zombie | 3 | 1 | Undead | Medium | Libris Mortis |
| 77 | 3 | Small Taint Elemental | 1 | 3 | Elemental | Small | Heroes of Horror |
| 78 | 3 | Spark Guardian | 1 | 3 | Construct | Tiny | Complete Warrior |
| 79 | 3 | Spectral Steed | 1 | 3 | Undead | Large | Ghostwalk |
| 80 | 3 | Spiritus Anime | 1 | 3 | Undead | Tiny | Dragon Compendium - Volume I |
| 81 | 3 | Stained Glass Half-Golem | 1 | 3 | Construct | Medium | MM2 |
| 82 | 3 | Stone Flyer | 1 | 3 | Magical Beast | Large | Underdark |
| 83 | 3 | Taga’rivvin | 3 | 1 | Animal | Large | Dragon #345 |
| 84 | 3 | Tatterdemanimal | 3 | 1 | Construct | Small | MM2 |
| 85 | 3 | Thoon Thrall, Human Commoner | 1 | 3 | Humanoid | Medium | MM5 |
| 86 | 3 | Tirbana Eyewing | 7 | 1/2 | Magical Beast | Tiny | MM5 |
| 87 | 3 | Toxic Ooze | 1 | 3 | Ooze | Medium | Dragon #350 |
| 88 | 3 | Troglodyte | 3 | 1 | Humanoid | Medium | MM1 |
| 89 | 3 | Troglodyte Zombie | 3 | 1 | Undead | Medium | MM1 |
| 90 | 3 | Tyrantfog Zombie | 1 | 3 | Undead | Medium | Monsters of Faerûn |
| 91 | 3 | Violet Fungus | 1 | 3 | Plant | Medium | MM1 |
| 92 | 3 | Viper Swarm | 1 | 3 | Animal | Diminutive | Fiend Folio |
| 93 | 3 | Wight | 1 | 3 | Undead | Medium | MM1 |
| 94 | 3 | Wyrmling Chromium Dragon | 1 | 3 | Dragon | Small | Dragon #356 |
| 95 | 3 | Wyrmling Cobalt Dragon | 1 | 3 | Dragon | Tiny | Dragon #356 |
| 96 | 3 | Wyrmling Emerald Dragon | 1 | 3 | Dragon | Small | MM2 |
| 97 | 3 | Wyrmling Hex Dragon | 1 | 3 | Dragon | Small | Dragon #343 |
| 98 | 3 | Wyrmling Mist Dragon | 1 | 3 | Dragon | Tiny | Dragons of Faerûn |
| 99 | 3 | Wyrmling Sapphire Dragon | 1 | 3 | Dragon | Tiny | MM2 |
| 100 | 3 | Wyrmling Shadow Dragon | 1 | 3 | Dragon | Tiny | Draconomicon |
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