| Striped Spider King | 38 | 27,440 | 336 | |
| Strength Nimbustian Captain | 150 | 47,475 | 2,196 | |
| Strength Nimbustian | 150 | 47,475 | 1,464 | |
| Strange Runewolf | 80 | 133,485 | 2,103 | |
| Storm Necromancer | 150 | 100,365 | 175 | — |
| Stoney Lunatix | 150 | 25,839 | 1 | |
| Stoney Dismalness | 150 | 19,817 | 1 | |
| Stoney Boogins | 88 | 35,982 | 773 | |
| Stoneskin Undine | 20 | 6,766 | 427 | |
| Stoneskin Undine | 150 | 13,421 | 1 | |
| Stone of Grief | 39 | 5,899 | 344 | |
| Stonefield Archdemon | 150 | 9,592,212 | 787 | — |
| Stone Brain | 150 | 1,479,222 | 834 | — |
| Stiren General | 150 | 184,903 | 8,382 | — |
| Stingtail Ursog King | 10 | 647 | 87 | |
| Stingtail Ursog | 9 | 528 | 78 | |
| Stinging Annoyance | 33 | 4,287 | 351 | — |
| Stiffler | 4 | 423 | 40 | — |
| Steppenwolf | 47 | 8,102 | 416 | — |
| Steelhorn Tortiose | 6 | 248 | 59 | — |
| Steelhide Puss | 49 | 11,481 | 427 | |
| Steelhide Grimalkin | 48 | 10,234 | 420 | |
| Steelfin Pike | 150 | 13,862 | 792 | — |
| Steelfang Grimalkin | 71 | 123,675 | 621 | |
| Steelation: Vacuity | 150 | 4,263,267 | 1,316 | |
| Steelation: Null | 150 | 3,813,658 | 1,316 | |
| Steelation: Doom | 150 | 4,598,007 | 1,316 | |
| Staunch Worm | 100 | 300 | 17 | — |
| Stampeding Cactopod | 20 | 7,518 | 427 | |
| Stalking Nien Minion | 75 | 59,292 | — | — |
| Squama | 11 | 857 | 96 | |
| Spukakke Tower | 100 | 307,636 | 2,845 | |
| Spukakke Messenger | 85 | 1,000,000 | 1,793 | — |
| Spukakke Gnosis | 100 | 42,200 | 966 | — |
| Spukakke Acaleph | 89 | 194,230 | 782 | — |
| Spring Tosser | 100 | 24,705 | — | — |
| Spring Naughty | 100 | 19,764 | — | — |
| Spotted Felis | 73 | 26,187 | 638 | — |
| Spotted Felis | 73 | 107,130 | 642 | |
| Spiritual Conbustier | 150 | 38,369 | 1 | |
| Spirit of Thromh the Mighty | 65 | 1,161,350 | 1 | |
| Spirit of Maelstrom | 60 | 14,133 | 607 | — |
| Spirit Fox | 100 | 100,000 | — | — |
| Spiralshell Crab | 43 | 8,370 | 17 | — |
| Spiralshell Crab | 43 | 8,370 | 17 | — |
| Spinewraith | 69 | 19,275 | 733 | |
| Spidercrab Hunter | 14 | 1,238 | 122 | — |
| Spidercrab | 6 | 248 | 56 | — |
| Sphere | 1 | 5,000 | 350,000 | |
| Sphere | 1 | 5,000 | 350,000 | |