Underground Random Encounters CR 5 v2
| d100 | Total CR | Name | Numbers | CR | Type | Size | Book |
| 1-2 | 5 | Kigrid | 1 | 5 | Aberration | Medium | Lords of Madness |
| 3-4 | 5 | Lava Ooze | 1 | 5 | Ooze | Large | Sandstorm |
| 5-6 | 5 | Lesser Knell Beetle | 1 | 5 | Vermin | Medium | MM3 |
| 7-8 | 5 | Lolth’s Sting | 1 | 5 | Humanoid | Medium | MM4 |
| 9-10 | 5 | Medium Husk Spider | 3 | 2 | Undead | Medium | Drow of the Underdark |
| 11-12 | 5 | Medium Taint Elemental | 1 | 5 | Elemental | Medium | Heroes of Horror |
| 13-14 | 5 | Metalmaster | 1 | 5 | Magical Beast | Large | Lost Empires of Faerûn |
| 15-16 | 5 | Minor Flame Snake | 7 | 1 | Magical Beast | Small | Fiend Folio |
| 17-18 | 5 | Minotaur Skeleton | 2 | 3 | Undead | Large | Libris Mortis |
| 19-20 | 5 | Mummified Ogre | 1 | 5 | Undead | Large | Libris Mortis |
| 21-22 | 5 | Mummy | 1 | 5 | Undead | Medium | MM1 |
| 23-24 | 5 | Murk | 2 | 3 | Undead | Medium | Libris Mortis |
| 25-26 | 5 | Myconid Elder Worker | 3 | 2 | Plant | Medium | MM2 |
| 27-28 | 5 | Necrophidius | 3 | 2 | Construct | Medium | Fiend Folio |
| 29-30 | 5 | Necroplasm | 2 | 3 | Undead | Medium | Ghostwalk |
| 31-32 | 5 | Necropolitan, 5th-Level Human Wizard | 1 | 5 | Undead | Medium | Libris Mortis |
| 33-34 | 5 | Nifern | 3 | 2 | Animal | Medium | Serpent Kingdoms |
| 35-36 | 5 | Night Hunter | 7 | 1 | Magical Beast | Medium | Monsters of Faerûn |
| 37-38 | 5 | Ophidian | 3 | 2 | Humanoid | Medium | Fiend Folio |
| 39-40 | 5 | Pest Swarm | 1 | 5 | Animal | Tiny | Cityscape |
| 41 | 5 | Phaerlin Giant | 2 | 3 | Giant | Huge | Monsters of Faerûn |
| 42 | 5 | Phaerlock | 3 | 2 | Humanoid | Medium | Underdark |
| 43 | 5 | Plague Ant Swarm | 1 | 5 | Vermin | Fine | Fiend Folio |
| 44 | 5 | Portal Drake | 1 | 5 | Dragon | Small | Underdark |
| 45 | 5 | Quell | 2 | 3 | Undead | Medium | Libris Mortis |
| 46 | 5 | Quicksilver Lizard | 3 | 2 | Animal | Large | Drow of the Underdark |
| 47 | 5 | Rat Swarm | 3 | 2 | Animal | Tiny | MM1 |
| 48 | 5 | Ravenous Ghoulish 1st-level Halfling Warrior | 3 | 2 | Undead | Small | Dragon Compendium - Volume I |
| 49 | 5 | Reason Stealer | 1 | 5 | Ooze | Medium | MM2 |
| 50 | 5 | Roving Mauler | 2 | 3 | Magical Beast | Medium | Tome of Magic |
| 51 | 5 | Rust Monster | 2 | 3 | Aberration | Medium | MM1 |
| 52 | 5 | Saltor | 2 | 3 | Aberration | Small | Lords of Madness |
| 53 | 5 | Sanguineous Drinker | 1 | 5 | Undead | Medium | MM5 |
| 54 | 5 | Shadow | 2 | 3 | Undead | Medium | MM1 |
| 55 | 5 | Shadow Asp | 7 | 1 | Magical Beast | Tiny | Fiend Folio |
| 56 | 5 | Shyft | 7 | 1 | Outsider | Medium | Fiend Folio |
| 57 | 5 | Sinister | 2 | 3 | Magical Beast | Large | Monsters of Faerûn |
| 58 | 5 | Skulk | 3 | 2 | Humanoid | Medium | Fiend Folio |
| 59 | 5 | Skum | 3 | 2 | Aberration | Medium | MM1 |
| 60 | 5 | Skum Zombie | 7 | 1 | Undead | Medium | Libris Mortis |
| 61 | 5 | Small Ectoplasmic Vermin | 15 | 1/2 | Vermin | Small | Ghostwalk |
| 62 | 5 | Spawn of Kyuss | 1 | 5 | Undead | Medium | MM2 |
| 63 | 5 | Spectral Spitting Felldrake | 1 | 5 | Undead | Medium | Dragons of Faerûn |
| 64 | 5 | Spectral Steed | 2 | 3 | Undead | Large | Ghostwalk |
| 65 | 5 | Spitting Felldrake | 3 | 2 | Dragon | Medium | MM2 |
| 66 | 5 | Spitting Spider | 1 | 5 | Vermin | Large | Drow of the Underdark |
| 67 | 5 | Stained Glass Golem | 1 | 5 | Construct | Medium | MM2 |
| 68 | 5 | Stained Glass Half-Golem | 2 | 3 | Construct | Medium | MM2 |
| 69 | 5 | Stone Flyer | 2 | 3 | Magical Beast | Large | Underdark |
| 70 | 5 | Stormcloud of Thoon | 1 | 5 | Construct | Medium | MM5 |
| 71 | 5 | Sword Spider | 1 | 5 | Vermin | Large | Monsters of Faerûn |
| 72 | 5 | Tall Mouther | 1 | 5 | Aberration | Large | Monsters of Faerûn |
| 73 | 5 | Tanarukk | 3 | 2 | Outsider | Medium | Monsters of Faerûn |
| 74 | 5 | Tatterdemanimal | 6 | 1 | Construct | Small | MM2 |
| 75 | 5 | Thoon Infiltrator | 1 | 5 | Humanoid | Medium | MM5 |
| 76 | 5 | Ti-khana Deinonychus | 1 | 5 | Magical Beast | Large | Fiend Folio |
| 77 | 5 | Tirbana Drowser | 3 | 2 | Magical Beast | Small | MM5 |
| 78 | 5 | Tomb Mote | 3 | 2 | Undead | Tiny | Libris Mortis |
| 79 | 5 | Troglodyte | 7 | 1 | Humanoid | Medium | MM1 |
| 80 | 5 | Troglodyte Zombie | 7 | 1 | Undead | Medium | MM1 |
| 81 | 5 | Tyrantfog Zombie | 2 | 3 | Undead | Medium | Monsters of Faerûn |
| 82 | 5 | Umber Hulk Zombie | 1 | 5 | Undead | Large | MM1 |
| 83 | 5 | Ustilagor | 3 | 2 | Aberration | Diminutive | Dragon #337 |
| 84 | 5 | Very young Amethyst Dragon | 1 | 5 | Dragon | Medium | MM2 |
| 85 | 5 | Very young Chromium Dragon | 1 | 5 | Dragon | Medium | Dragon #356 |
| 86 | 5 | Very young Cobalt Dragon | 1 | 5 | Dragon | Small | Dragon #356 |
| 87 | 5 | Very young Emerald Dragon | 1 | 5 | Dragon | Medium | MM2 |
| 88 | 5 | Very young Sapphire Dragon | 1 | 5 | Dragon | Small | MM2 |
| 89 | 5 | Violet Fungus | 2 | 3 | Plant | Medium | MM1 |
| 90 | 5 | War Bat | 1 | 5 | Animal | Huge | MM2 |
| 91 | 5 | Wight | 2 | 3 | Undead | Medium | MM1 |
| 92 | 5 | Wraith | 1 | 5 | Undead | Medium | MM1 |
| 93 | 5 | Wyrmling Chromium Dragon | 2 | 3 | Dragon | Small | Dragon #356 |
| 94 | 5 | Wyrmling Cobalt Dragon | 2 | 3 | Dragon | Tiny | Dragon #356 |
| 95 | 5 | Wyrmling Emerald Dragon | 2 | 3 | Dragon | Small | MM2 |
| 96 | 5 | Wyrmling Hex Dragon | 2 | 3 | Dragon | Small | Dragon #343 |
| 97 | 5 | Wyrmling Mist Dragon | 2 | 3 | Dragon | Tiny | Dragons of Faerûn |
| 98 | 5 | Wyrmling Sapphire Dragon | 2 | 3 | Dragon | Tiny | MM2 |
| 99 | 5 | Wyrmling Shadow Dragon | 2 | 3 | Dragon | Tiny | Draconomicon |
| 100 | 5 | Young Mist Dragon | 1 | 5 | Dragon | Medium | Dragons of Faerûn |
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