Underground Random Encounters CR 1
| d100 | Total CR | Name | Numbers | CR | Type | Size | Book |
| 1-3 | 1 | Changeling, 1st-Level Warrior | 3 | 1/2 | Humanoid | Medium | MM3 |
| 4-6 | 1 | Chaond | 1 | 1 | Outsider | Medium | MM2 |
| 7-9 | 1 | Clockroach | 1 | 1 | Construct | Small | MM4 |
| 10-12 | 1 | Crested Felldrake | 1 | 1 | Dragon | Small | MM2 |
| 13-15 | 1 | Crystal Cat | 1 | 1 | Construct | Tiny | Dragon #341 |
| 16-18 | 1 | Darkmantle | 1 | 1 | Magical Beast | Small | MM1 |
| 19-20 | 1 | Dire Rat Skeleton | 5 | 1/3 | Undead | Small | Libris Mortis |
| 21-22 | 1 | Dire Rat Zombie | 3 | 1/2 | Undead | Small | Libris Mortis |
| 23-24 | 1 | Eyeball Beholderkin | 2 | 1/2 | Aberration | Diminutive | Monsters of Faerûn |
| 25-26 | 1 | Fetid Fungus | 1 | 1 | Plant | Medium | MM5 |
| 27-28 | 1 | Ghost | 1 | 1 | Outsider | Medium | Ghostwalk |
| 29-30 | 1 | Ghoul | 1 | 1 | Undead | Medium | MM1 |
| 31-32 | 1 | Giant Maggot | 3 | 1/2 | Vermin | Small | Underdark |
| 33-34 | 1 | Giant Whip Spider | 1 | 1 | Vermin | Medium | Lost Empires of Faerûn |
| 35-36 | 1 | Glass Dragonfly | 1 | 1 | Construct | Tiny | Dragon #341 |
| 37-38 | 1 | Gnome Warrior Zombie | 3 | 1/2 | Undead | Small | Libris Mortis |
| 39-40 | 1 | Hairy Spider | 3 | 1/2 | Vermin | Fine | Monsters of Faerûn |
| 41-42 | 1 | Halfling Warrior Skeleton | 5 | 1/3 | Undead | Small | Libris Mortis |
| 43-44 | 1 | Hatchling Phaerimm | 1 | 1 | Aberration | Tiny | Lost Empires of Faerûn |
| 45-46 | 1 | Homunculus | 1 | 1 | Construct | Tiny | MM1 |
| 47-48 | 1 | Human Commoner Zombie | 3 | 1/2 | Undead | Medium | MM1 |
| 49-50 | 1 | Human Warrior Skeleton | 5 | 1/3 | Undead | Medium | MM1 |
| 51-52 | 1 | Jermlaine | 3 | 1/2 | Fey | Tiny | MM2 |
| 53-54 | 1 | Large Monstrous Centipede | 1 | 1 | Vermin | Large | MM1 |
| 55-56 | 1 | Mechanatrix | 3 | 1/2 | Outsider | Medium | Fiend Folio |
| 57-58 | 1 | Medium Monstrous Centipede | 3 | 1/2 | Vermin | Medium | MM1 |
| 59-60 | 1 | Mercurial Spider | 1 | 1 | Construct | Tiny | Dragon #341 |
| 61-62 | 1 | Mindshredder Larva | 1 | 1 | Aberration | Small | MM3 |
| 63-64 | 1 | Minor Flame Snake | 1 | 1 | Magical Beast | Small | Fiend Folio |
| 65-66 | 1 | Mongrelfolk | 5 | 1/3 | Humanoid | Medium | Fiend Folio |
| 67-68 | 1 | Myconid Average Worker | 1 | 1 | Plant | Small | MM2 |
| 69-70 | 1 | Myconid Junior Worker | 3 | 1/2 | Plant | Tiny | MM2 |
| 71-72 | 1 | Raiment | 1 | 1 | Undead | Small | Libris Mortis |
| 73-74 | 1 | Rat | 15 | 1/8 | Animal | Tiny | MM1 |
| 75-76 | 1 | Salvage Rat | 1 | 1 | Construct | Tiny | Dragon #341 |
| 77-78 | 1 | Shadow Asp | 1 | 1 | Magical Beast | Tiny | Fiend Folio |
| 79-80 | 1 | Shrieker | 1 | 1 | Plant | Medium | MM1 |
| 81-82 | 1 | Shyft | 1 | 1 | Outsider | Medium | Fiend Folio |
| 83-84 | 1 | Skum Zombie | 1 | 1 | Undead | Medium | Libris Mortis |
| 85-86 | 1 | Small Monstrous Centipede | 7 | 1/4 | Vermin | Small | MM1 |
| 87-88 | 1 | Taga’rivvin | 1 | 1 | Animal | Large | Dragon #345 |
| 89-90 | 1 | Tatterdemanimal | 1 | 1 | Construct | Small | MM2 |
| 91-92 | 1 | Tiny Monstrous Centipede | 15 | 1/8 | Vermin | Tiny | MM1 |
| 93-94 | 1 | Tirbana Eyewing | 3 | 1/2 | Magical Beast | Tiny | MM5 |
| 95-96 | 1 | Troglodyte Zombie | 1 | 1 | Undead | Medium | MM1 |
| 97-98 | 1 | Two-headed Adder | 1 | 1 | Animal | Small | Forgotten Realms Campaign Setting |
| 99-100 | 1 | Zenythri | 1 | 1 | Outsider | Medium | MM2 |
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