 Bronze dragon (Standard) | 67 | 1/5,461.33 |
 Brutal black dragon | 67 | 1/2,730.67 |
 Brutal blue dragon (Catacombs of Kourend) | 67 | 1/3,640.89 |
 Brutal green dragon | 17 | 5/128 |
| Brutal green dragon | 67 | 1/1,820.44 |
 Brutal red dragon | 67 | 1/2,730.67 |
| Bryophyta (Free-to-play) | 6 | 3/128 |
| Bryophyta (Members) | 6 | 3/128 |
 Cave abomination | 6 | 6/128, 3 rolls |
| Cave abomination | 4 | 5/128, 3 rolls |
| Cave abomination | 3 | 1/128, 3 rolls |
 Cave bug (Level 6) | 1 | 5/128 |
| Cave bug (Level 6) | 2 | 1/128 |
| Cave crawler | 3–4 | 6/128 |
 Cave horror (Worker) | 6 | 6/128 |
| Cave horror (Worker) | 4 | 5/128 |
| Cave horror (Worker) | 3 | 1/128 |
 Cerberus | 67 | 1/1,848.89 |
 Chaos druid | 3 | 1/128 |
 Chaos druid warrior | 3 | 1/128 |
 Chaos dwarf | 9 | 3/128 |
 Chaos Elemental | 67 | 1/682.67 |
 Chaos Fanatic | 67 | 1/1,365.33 |
 Chasm Crawler (Standard) | 3–4 | 6/128, 3 rolls |
| Chest (Bryophyta's lair) (Free-to-play) | 100 | 8/118 |
| Chest (Bryophyta's lair) (Members) | 100 | 8/118 |
| Chest (Dorgesh-Kaan Average) (Oldak's chests) | 2–4 | 1/20 |
| Chest (Isle of Souls Dungeon) | 1–2 | 20/200 |
| Chest (moon key) | 500 | 10/107 |
| Chest (nature runes) | 1 | Always |
| Chest (Obor's lair) | 40–79 | 7/118 |
| Chest (Rogues' Castle, inside) | 2–3 | 4/128 |
| Chest (Rogues' Castle) (Hard Wilderness Diary) | 50 | 11/66 |
| Chest (Rogues' Castle) (Medium Wilderness Diary) | 40 | 11/66 |
 Cockathrice | 2 | 6/128, 3 rolls |
| Cockathrice | 4 | 4/128, 3 rolls |
| Cockathrice | 6 | 2/128, 3 rolls |
 Cockatrice | 2 | 6/128 |
| Cockatrice | 4 | 4/128 |
| Cockatrice | 6 | 2/128 |
| Coffin (Hallowed Sepulchre) (Mid) | 60–100 | 1/10 |
 Colonel Radick | 2 | 1/128 |
 Commander Zilyana | 62–67 | 1/677.33 |
 Crazy archaeologist | 67 | 1/1,365.33 |
| Crystal chest | 10 | 12/128 |
 Cyclops | 6 | 2/128 |
| Cyclops (Warriors' Guild Basement) | 67 | 1/2,133.33 |
 Dagannoth (Level 90) | 1–10 | 10/128 |