 Borrokar | 1 | 1/595.8 |
 Branda the Fire Queen | 6–8 | 2/55, 2 rolls |
 Brassican Mage | 1 | 1/116.4 |
 Bree | 1 | 8/127 |
 Breoca | 1 | 1/64.8 |
 Brutal green dragon | 1 | 1/99.3 |
| Bryophyta (Members) | 1 | 1/297.9 |
 Butterfly ray | 1–2 | 1/44.5 |
 Callisto | 45 | 1/126 |
 Calvar'ion (Normal) | 60 | 1/128 |
 Catablepon (Level 49) | 1 | 1/391.8 |
 Cave abomination | 1 | 1/114.6, 3 rolls |
 Cave bug (Level 6) | 1 | 1/64.8 |
 Cave bug (Level 96) | 1 | 1/78.4 |
| Cave crawler | 1 | 1/67.7 |
 Cave horror (Worker) | 1 | 1/114.6 |
 Cave kraken (Cave kraken) | 1 | 1/387.9 |
 Ceolburg | 1 | 1/64.8 |
 Chaos druid | 1–2 | 1/32.4 |
 Chaos druid warrior | 1–2 | 1/33.9 |
 Chaos Elemental | 5–8 | 4/128 |
 Chasm Crawler (Standard) | 1 | 1/67.7, 3 rolls |
| Chest (alchemist's signet) | 1 | 1/4 |
| Chest (Bryophyta's lair) (Members) | 1 | 1/274.6 |
| Chest (Isle of Souls Dungeon) | 1 | 10/200 |
 Choke devil | 1 | 1/186.2, 3 rolls |
 Cockathrice | 1 | 1/148.9, 3 rolls |
 Cockatrice | 1 | 1/148.9 |
| Coffin (Hallowed Sepulchre) (Mid) | 1–2 | 1/10 |
 Colossal Hydra | 1–3 | 1/372.4, 3 rolls |
| Colossal Hydra | 3 | 1/240, 3 rolls |
 Commander Zilyana | 5 | 8/127 |
 Crocodile (Water) | 1 | 1/232.7 |
 Cuffs | 1 | 1/64.8 |
 Cyclops | 1 | 1/212.8 |
 Cyclops (Level 56) | 1 | 1/387.9 |
 Cyclops (Green) | 1 | 1/387.9 |
| Cyclops (Warriors' Guild Basement) | 1 | 1/290.9 |
| Cyclops (Warriors' Guild Rooftop) | 1 | 1/387.9 |
 Dagannoth (Level 88) | 1 | 1/186.2 |
 Dagannoth (Level 90) | 1 | 1/372.4 |
 Dagannoth Prime | 1 | 5/128 |
 Dagannoth Rex | 1 | 7/128 |
 Dagannoth Supreme | 1 | 5/128 |
 Dark beast | 1 | 1/78.4 |
| Dark beast | 1 | 1/297.9, 2 rolls |
| Dark Chest | 10–15 | 25/600 |
| Dark warrior (Great Kourend) | 1 | 1/496.5 |