Underground Random Encounters CR 4 v2
| d100 | Total CR | Name | Numbers | CR | Type | Size | Book |
| 1-2 | 4 | Living Wall 4th-level Human Warrior | 1 | 4 | Undead | Medium | Dragon #343 |
| 3-4 | 4 | Magmacore Golem | 1 | 4 | Construct | Medium | MM5 |
| 5-6 | 4 | Meazel | 1 | 4 | Humanoid | Medium | Monsters of Faerûn |
| 7-8 | 4 | Medium Husk Spider | 2 | 2 | Undead | Medium | Drow of the Underdark |
| 9-10 | 4 | Mimic | 1 | 4 | Aberration | Large | MM1 |
| 11-12 | 4 | Mindshredder Larva | 5 | 1 | Aberration | Small | MM3 |
| 13-14 | 4 | Mindshredder Warrior | 1 | 4 | Aberration | Large | MM3 |
| 15-16 | 4 | Minor Flame Snake | 5 | 1 | Magical Beast | Small | Fiend Folio |
| 17-18 | 4 | Minotaur | 1 | 4 | Humanoid | Large | MM1 |
| 19-20 | 4 | Minotaur Zombie | 1 | 4 | Undead | Large | MM1 |
| 21-22 | 4 | Moonrat | 20 | 1/4 | Magical Beast | Tiny | MM2 |
| 23-24 | 4 | Myconid Average Worker | 5 | 1 | Plant | Small | MM2 |
| 25-26 | 4 | Myconid Elder Worker | 2 | 2 | Plant | Medium | MM2 |
| 27-28 | 4 | Myconid Guard | 1 | 4 | Plant | Medium | MM2 |
| 29-30 | 4 | Necrophidius | 2 | 2 | Construct | Medium | Fiend Folio |
| 31-32 | 4 | Neogi Spawn | 20 | 1/4 | Aberration | Tiny | MM2 |
| 33-34 | 4 | Nether Hound Ghast | 1 | 4 | Undead | Medium | Dragon #322 |
| 35-36 | 4 | Nifern | 2 | 2 | Animal | Medium | Serpent Kingdoms |
| 37-38 | 4 | Night Hunter | 5 | 1 | Magical Beast | Medium | Monsters of Faerûn |
| 39-40 | 4 | Norker | 9 | 1/2 | Humanoid | Small | Dragon #343 |
| 41-42 | 4 | Ogre Savage Vampire | 1 | 4 | Undead | Large | Dragon #348 |
| 43-44 | 4 | Otyugh | 1 | 4 | Aberration | Large | MM1 |
| 45-46 | 4 | Painspeaker | 1 | 4 | Undead | Medium | Tome of Magic |
| 47-48 | 4 | Phaerlock | 2 | 2 | Humanoid | Medium | Underdark |
| 49-50 | 4 | Pulverizer | 1 | 4 | Construct | Medium | MM2 |
| 51-52 | 4 | Quicksilver Lizard | 2 | 2 | Animal | Large | Drow of the Underdark |
| 53-54 | 4 | Rat Swarm | 2 | 2 | Animal | Tiny | MM1 |
| 55-56 | 4 | Ravenous Ghoulish 1st-level Halfling Warrior | 2 | 2 | Undead | Small | Dragon Compendium - Volume I |
| 57-58 | 4 | Rylkspawn Swarm | 1 | 4 | Magical Beast | Tiny | MM5 |
| 59-60 | 4 | Serpentir | 1 | 4 | Undead | Large | MM5 |
| 61-62 | 4 | Shadow Asp | 5 | 1 | Magical Beast | Tiny | Fiend Folio |
| 63 | 4 | Shrieker | 5 | 1 | Plant | Medium | MM1 |
| 64 | 4 | Shyft | 5 | 1 | Outsider | Medium | Fiend Folio |
| 65 | 4 | Skulk | 2 | 2 | Humanoid | Medium | Fiend Folio |
| 66 | 4 | Skulking Cyst | 1 | 4 | Undead | Small | Libris Mortis |
| 67 | 4 | Skum | 2 | 2 | Aberration | Medium | MM1 |
| 68 | 4 | Skum Zombie | 5 | 1 | Undead | Medium | Libris Mortis |
| 69 | 4 | Small Ectoplasmic Vermin | 11 | 1/2 | Vermin | Small | Ghostwalk |
| 70 | 4 | Spectral Lyrist | 1 | 4 | Undead | Medium | Libris Mortis |
| 71 | 4 | Spellstitched Ghast | 1 | 4 | Undead | Medium | Complete Arcane |
| 72 | 4 | Spitting Felldrake | 2 | 2 | Dragon | Medium | MM2 |
| 73 | 4 | Stinger | 1 | 4 | Humanoid | Large | Monsters of Faerûn |
| 74 | 4 | Stone Drake | 1 | 4 | Dragon | Medium | Races of Stone |
| 75 | 4 | Stone Half-Golem | 1 | 4 | Construct | Medium | MM2 |
| 76 | 4 | Subterranean Lizard | 1 | 4 | Animal | Large | Drow of the Underdark |
| 77 | 4 | Summoning Ooze | 1 | 4 | Ooze | Medium | MM3 |
| 78 | 4 | Taga’rivvin | 5 | 1 | Animal | Large | Dragon #345 |
| 79 | 4 | Tanarukk | 2 | 2 | Outsider | Medium | Monsters of Faerûn |
| 80 | 4 | Tatterdemanimal | 5 | 1 | Construct | Small | MM2 |
| 81 | 4 | Thrum Worm | 2 | 2 | Magical Beast | Medium | Races of Stone |
| 82 | 4 | Tiny Ectoplasmic Vermin | 16 | 1/3 | Vermin | Tiny | Ghostwalk |
| 83 | 4 | Tirbana Drowser | 2 | 2 | Magical Beast | Small | MM5 |
| 84 | 4 | Tirbana Eyewing | 11 | 1/2 | Magical Beast | Tiny | MM5 |
| 85 | 4 | Tirbana Slayer | 1 | 4 | Magical Beast | Medium | MM5 |
| 86 | 4 | Tomb Mote | 2 | 2 | Undead | Tiny | Libris Mortis |
| 87 | 4 | Troglodyte | 5 | 1 | Humanoid | Medium | MM1 |
| 88 | 4 | Troglodyte Zombie | 5 | 1 | Undead | Medium | MM1 |
| 89 | 4 | Ustilagor | 2 | 2 | Aberration | Diminutive | Dragon #337 |
| 90 | 4 | Vampire Spawn | 1 | 4 | Undead | Medium | MM1 |
| 91 | 4 | Very young Hex Dragon | 1 | 4 | Dragon | Medium | Dragon #343 |
| 92 | 4 | Very young Mist Dragon | 1 | 4 | Dragon | Small | Dragons of Faerûn |
| 93 | 4 | Very young Shadow Dragon | 1 | 4 | Dragon | Small | Draconomicon |
| 94 | 4 | Vivisector | 1 | 4 | Aberration | Medium | MM5 |
| 95 | 4 | Wererat | 2 | 2 | Humanoid | Medium | MM1 |
| 96 | 4 | Wyrmling Amethyst Dragon | 1 | 4 | Dragon | Small | MM2 |
| 97 | 4 | Wyrmling Brainstealer Dragon | 1 | 4 | Dragon | Medium | Dragon #337 |
| 98 | 4 | Wyrmling Deep Dragon | 1 | 4 | Dragon | Tiny | Monsters of Faerûn |
| 99 | 4 | Yellow Musk Creeper | 1 | 4 | Plant | Huge | Fiend Folio |
| 100 | 4 | Zern Blade Thrall | 1 | 4 | Humanoid | Large | MM4 |
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