| Zuggtmoy | 23 | Fiend (demon) | Large | 18 | 304 | | chaotic evil | | Mordenkainen's Tome of Foes | | | | | | |
| Zombie | 0.25 | Undead | Medium | 8 | 22 | | neutral evil | | Monster Manual (SRD) | 13 | 6 | 16 | 3 | 6 | 5 |
| Zariel | 26 | Fiend (devil) | Large | 21 | 580 | fly | lawful evil | Legendary | Mordenkainen's Tome of Foes | 27 | 24 | 28 | 26 | 27 | 30 |
| Zaratan | 22 | Elemental | Gargantuan | 21 | 307 | swim | neutral | | Mordenkainen's Tome of Foes | | | | | | |
| Yuan ti pureblood | 1 | Humanoid (yuan-ti) | Medium | 11 | 40 | | neutral evil | | Monster Manual (BR) | 11 | 12 | 11 | 13 | 12 | 14 |
| Yuan ti pit master | 5 | Monstrosity (shapechanger, yuan-ti) | Medium | 14 | 88 | | neutral evil | | Volo's Guide to Monsters | | | | | | |
| Yuan ti nightmare speaker | 4 | Monstrosity (shapechanger, yuan-ti) | Medium | 14 | 71 | | neutral evil | | Volo's Guide to Monsters | 16 | 14 | 13 | 14 | 12 | 16 |
| Yuan ti mind whisperer | 4 | Monstrosity (shapechanger, yuan-ti) | Medium | 14 | 71 | | neutral evil | | Volo's Guide to Monsters | | | | | | |
| Yuan ti malison | 3 | Monstrosity (shapechanger, yuan-ti) | Medium | 12 | 66 | | neutral evil | | Monster Manual (BR) | 16 | 14 | 13 | 14 | 12 | 16 |
| Yuan ti broodguard | 2 | Humanoid (yuan-ti) | Medium | 14 | 45 | | neutral evil | | Volo's Guide to Monsters | | | | | | |
| Yuan ti anathema | 12 | Monstrosity (shapechanger, yuan-ti) | Huge | 16 | 189 | swim | neutral evil | | Volo's Guide to Monsters | | | | | | |
| Yuan ti abomination | 7 | Monstrosity (shapechanger, yuan-ti) | Large | 15 | 127 | | neutral evil | | Monster Manual (BR) | 19 | 16 | 17 | 17 | 15 | 18 |
| Young white dragon | 6 | Dragon | Large | 17 | 133 | fly, swim | chaotic evil | | Monster Manual (SRD) | 18 | 10 | 18 | 6 | 11 | 12 |
| Young silver dragon | 9 | Dragon | Large | 18 | 168 | fly | lawful good | | Monster Manual (SRD) | 23 | 10 | 21 | 14 | 11 | 19 |
| Young remorhaz | 5 | Monstrosity | Large | 14 | 93 | | unaligned | | Monster Manual | | | | | | |
| Young red shadow dragon | 13 | Dragon | Large | 18 | 178 | fly | chaotic evil | | Monster Manual | | | | | | |
| Young red dragon | 10 | Dragon | Large | 18 | 178 | fly | chaotic evil | | Monster Manual (SRD) | 23 | 10 | 21 | 14 | 11 | 19 |
| Young kruthik | 0.12 | Monstrosity | Small | 16 | 9 | | unaligned | | Mordenkainen's Tome of Foes | | | | | | |
| Young green dragon | 8 | Dragon | Large | 18 | 136 | fly, swim | lawful evil | | Monster Manual (SRD) | 19 | 12 | 17 | 16 | 13 | 15 |
| Young gold dragon | 10 | Dragon | Large | 18 | 178 | fly, swim | lawful good | | Monster Manual (SRD) | 23 | 14 | 21 | 16 | 13 | 20 |
| Young copper dragon | 7 | Dragon | Large | 17 | 119 | fly | chaotic good | | Monster Manual (SRD) | 19 | 12 | 17 | 16 | 13 | 15 |
| Young bronze dragon | 8 | Dragon | Large | 18 | 142 | fly, swim | lawful good | | Monster Manual (SRD) | 21 | 10 | 19 | 14 | 13 | 17 |
| Young brass dragon | 6 | Dragon | Large | 17 | 110 | fly | chaotic good | | Monster Manual (SRD) | 19 | 10 | 17 | 12 | 11 | 15 |
| Young blue dragon | 9 | Dragon | Large | 18 | 152 | fly | lawful evil | | Monster Manual (SRD) | 21 | 10 | 19 | 14 | 13 | 17 |
| Young black dragon | 7 | Dragon | Large | 18 | 127 | fly, swim | chaotic evil | | Monster Manual (SRD) | 19 | 14 | 17 | 12 | 11 | 15 |