Underground Random Encounters CR 5
| d100 | Total CR | Name | Numbers | CR | Type | Size | Book |
| 1-2 | 5 | Adamantine Spider | 2 | 3 | Construct | Small | Drow of the Underdark |
| 3-4 | 5 | Average Psurlon | 1 | 5 | Aberration | Medium | Lords of Madness |
| 5-6 | 5 | Baneguard | 3 | 2 | Undead | Medium | Lost Empires of Faerûn |
| 7-8 | 5 | Baphitaur | 3 | 2 | Outsider | Medium | Underdark |
| 9-10 | 5 | Beacon Moth | 1 | 5 | Magical Beast | Huge | Dragon #322 |
| 11-12 | 5 | Bluespawn Stoneglider | 2 | 3 | Humanoid | Medium | Dragons of Faerûn |
| 13-14 | 5 | Boar Topiary Guardian | 2 | 3 | Plant | Medium | MM3 |
| 15-16 | 5 | Boggle | 2 | 3 | Humanoid | Small | MM2 |
| 17-18 | 5 | Bone Rat Swarm | 2 | 3 | Undead | Tiny | Libris Mortis |
| 19-20 | 5 | Bonebat | 3 | 2 | Undead | Medium | Monsters of Faerûn |
| 21-22 | 5 | Boneclaw | 1 | 5 | Undead | Large | MM3 |
| 23-24 | 5 | Bonesinger | 2 | 3 | Undead | Medium | Ghostwalk |
| 25-26 | 5 | Bonespitter | 2 | 3 | Undead | Medium | Dragon Compendium - Volume I |
| 27-28 | 5 | Bonespur | 2 | 3 | Undead | Large | MM5 |
| 29-30 | 5 | Brass Half-Golem | 1 | 5 | Construct | Medium | MM2 |
| 31-32 | 5 | Cave Fisher | 3 | 2 | Vermin | Medium | Dragon #355 |
| 33-34 | 5 | Cave Triceratop | 1 | 5 | Animal | Large | Miniatures Handbook |
| 35-36 | 5 | Cave Tyrannosaurus | 1 | 5 | Animal | Large | Miniatures Handbook |
| 37-38 | 5 | Chain Golem | 1 | 5 | Construct | Medium | MM2 |
| 39-40 | 5 | Changeling, 1st-Level Warrior | 15 | 1/2 | Humanoid | Medium | MM3 |
| 41 | 5 | Chitine | 7 | 1 | Humanoid | Small | Monsters of Faerûn |
| 42 | 5 | Cloaker | 1 | 5 | Aberration | Large | MM1 |
| 43 | 5 | Clockroach | 6 | 1 | Construct | Small | MM4 |
| 44 | 5 | Copper Horror | 3 | 2 | Construct | Small | Dragon #350 |
| 45 | 5 | Crawling Claw | 3 | 2 | Construct | Tiny | Lost Empires of Faerûn |
| 46 | 5 | Crested Felldrake | 7 | 1 | Dragon | Small | MM2 |
| 47 | 5 | Cursed Spirit | 2 | 3 | Undead | Medium | Miniatures Handbook |
| 48 | 5 | Darkmantle | 7 | 1 | Magical Beast | Small | MM1 |
| 49 | 5 | Deadly Dancer | 2 | 3 | Aberration | Medium | Tome of Magic |
| 50 | 5 | Dekanter Goblin | 7 | 1 | Humanoid | Medium | Monsters of Faerûn |
| 51 | 5 | Derro | 2 | 3 | Humanoid | Small | MM1 |
| 52 | 5 | Desiccator | 3 | 2 | Undead | Small | Libris Mortis |
| 53 | 5 | Dire Maggot | 3 | 2 | Vermin | Small | Libris Mortis |
| 54 | 5 | Dire Rat | 20 | 1/3 | Animal | Small | MM1 |
| 55 | 5 | Dire Rat Skeleton | 20 | 1/3 | Undead | Small | Libris Mortis |
| 56 | 5 | Dire Rat Zombie | 15 | 1/2 | Undead | Small | Libris Mortis |
| 57 | 5 | Dire Snake | 1 | 5 | Animal | Huge | MM2 |
| 58 | 5 | Direguard | 2 | 3 | Undead | Medium | Lost Empires of Faerûn |
| 59 | 5 | Doppelganger | 2 | 3 | Humanoid | Medium | MM1 |
| 60 | 5 | Dread | 3 | 2 | Undead | Small | Lost Empires of Faerûn |
| 61 | 5 | Dread Guard | 3 | 2 | Construct | Medium | MM2 |
| 62 | 5 | Dread Ram | 2 | 3 | Undead | Large | Ghostwalk |
| 63 | 5 | Earth Whisper | 1 | 5 | Elemental | Medium | Races of Stone |
| 64 | 5 | Entomber | 1 | 5 | Undead | Medium | Libris Mortis |
| 65 | 5 | Faerzress-infused Minotaur | 1 | 5 | Humanoid | Large | Underdark |
| 66 | 5 | Fey’ri | 3 | 2 | Outsider | Medium | Monsters of Faerûn |
| 67 | 5 | Fihyr | 2 | 3 | Aberration | Small | MM2 |
| 68 | 5 | Fleshvigor Ghoul | 3 | 2 | Undead | Medium | Dragon #315 |
| 69 | 5 | Foulwing | 1 | 5 | Aberration | Huge | Lost Empires of Faerûn |
| 70 | 5 | Gargoyle Kir-Lanan | 3 | 2 | Humanoid | Medium | Forgotten Realms Campaign Setting |
| 71 | 5 | Ghast | 2 | 3 | Undead | Medium | MM1 |
| 72 | 5 | Ghaunadan | 1 | 5 | Aberration | Medium | Monsters of Faerûn |
| 73 | 5 | Ghosteater | 2 | 3 | Aberration | Medium | Ghostwalk |
| 74 | 5 | Ghoul | 7 | 1 | Undead | Medium | MM1 |
| 75 | 5 | Ghoulish Harpy | 1 | 5 | Undead | Medium | Dragon Compendium - Volume I |
| 76 | 5 | Giant Cockroach | 3 | 2 | Vermin | Medium | Underdark |
| 77 | 5 | Giant Sun Spider | 3 | 2 | Vermin | Large | Lost Empires of Faerûn |
| 78 | 5 | Gibbering Mouther | 1 | 5 | Aberration | Medium | MM1 |
| 79 | 5 | Gibberling | 20 | 1/3 | Humanoid | Small | Monsters of Faerûn |
| 80 | 5 | Gnome Warrior Zombie | 15 | 1/2 | Undead | Small | Libris Mortis |
| 81 | 5 | Gravehound | 2 | 3 | Undead | Medium | Miniatures Handbook |
| 82 | 5 | Greenspawn Zealot | 1 | 5 | Humanoid | Medium | MM5 |
| 83 | 5 | Grell | 2 | 3 | Aberration | Medium | MM2 |
| 84 | 5 | Grick | 2 | 3 | Aberration | Medium | MM1 |
| 85 | 5 | Groundling | 3 | 2 | Humanoid | Medium | Monsters of Faerûn |
| 86 | 5 | Guardgoyle | 3 | 2 | Construct | Small | Waterdeep |
| 87 | 5 | Guttersnipe | 1 | 5 | Construct | Medium | MM2 |
| 88 | 5 | Hairy Spider | 15 | 1/2 | Vermin | Fine | Monsters of Faerûn |
| 89 | 5 | Half-Fiend Draegloth | 1 | 5 | Outsider | Large | Monsters of Faerûn |
| 90 | 5 | Halfling Warrior Skeleton | 20 | 1/3 | Undead | Small | Libris Mortis |
| 91 | 5 | Hatchling Phaerimm | 5 | 1 | Aberration | Tiny | Lost Empires of Faerûn |
| 92 | 5 | Horned Felldrake | 2 | 3 | Dragon | Medium | MM2 |
| 93 | 5 | Huge Animate Object | 1 | 5 | Construct | Huge | MM1 |
| 94 | 5 | Huge Monstrous Centipede | 3 | 2 | Vermin | Huge | MM1 |
| 95 | 5 | Human Commoner Zombie | 15 | 1/2 | Undead | Medium | MM1 |
| 96 | 5 | Human Warrior Skeleton | 20 | 1/3 | Undead | Medium | MM1 |
| 97 | 5 | Ice Beast Gargoyle | 2 | 3 | Construct | Medium | Frostburn |
| 98 | 5 | Illithocyte | 3 | 2 | Aberration | Small | Dragon #337 |
| 99 | 5 | Ineffable Horror | 1 | 5 | Aberration | Large | Underdark |
| 100 | 5 | Juvenile Phaerimm | 1 | 5 | Aberration | Small | Lost Empires of Faerûn |
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