 Aberrant spectre | 460 | 1/128 |
 Abhorrent spectre | 460 | 1/128, 3 rolls |
 Abyssal demon (Standard) | 132 | 35/128 |
| Abyssal demon (Standard) | 220 | 9/128 |
| Abyssal demon (Standard) | 30 | 7/128 |
| Abyssal demon (Standard) | 44 | 6/128 |
| Abyssal demon (Standard) | 460 | 1/128 |
| Abyssal demon (Standard) | 3,000 | 1/390.1 |
| Abyssal demon (Wilderness Slayer Cave) | 3,000 | 1/207.24 |
 Abyssal Sire (Phase 1) | 48,000–52,000 | 11/139 |
| Abyssal Sire (Phase 1) | 6,000 | 1/282.41 |
 Adamant dragon | 3,000 | 1/670.48 |
| Adventurer Jon (Body Builder) | 500 | Always |
| Adventurer Jon (Getting a grip) | 500 | Always |
| Adventurer Jon (Getting started Attack) | 500 | Always |
| Adventurer Jon (Weapons master) | 1,000 | Always |
 Afflicted (Level 30) | 3 | 38/128 |
| Afflicted (Level 30) | 5 | 9/128 |
| Afflicted (Level 30) | 15 | 4/128 |
| Afflicted (Level 30) | 25 | 1/128 |
 Agnar (Normal) | 40 | Always |
 Air elemental | 12 | 36/128 |
| Air elemental | 42 | 3/128 |
 Al Kharid warrior | 3 | 38/128 |
| Al Kharid warrior | 10 | 23/128 |
| Al Kharid warrior | 5 | 9/128 |
| Al Kharid warrior | 15 | 4/128 |
| Al Kharid warrior | 25 | 1/128 |
| Al Kharid warrior | 18 | Always |
 Alchemical Hydra (Serpentine) | 5,550–25,550 | 0.5/101, 2 rolls |
| Alchemical Hydra (Serpentine) | 40,000–60,000 | 9.5/101, 2 rolls |
| Alchemical Hydra (Serpentine) | 3,000 | 1/615.62, 2 rolls |
 Alexis | 6 | 20/512 |
| Alexis | 15 | 5/512 |
| Alexis | 16 | 5/512 |
| Alexis | 20 | 10/512 |
| Alexis | 38 | 5/512 |
| Alexis | 50 | 5/512 |
| Alexis | 96 | 5/512 |
| Alexis | 120 | 5/512 |
 Ancient Custodian | 1,180–1,300 | 19/124, 3 rolls |
| Ancient Custodian | 3,000 | 1/755.81, 3 rolls |
 Ancient Wizard (Mage) | 50–249 | 10/50 |
 Ancient Wyvern | 2,000–6,000 | 7/132 |
| Ancient Wyvern | 3,000 | 1/402.29 |
 Angry barbarian spirit | 142 | 10/128 |
| Angry barbarian spirit | 106 | 5/128 |
| Angry barbarian spirit | 106 | 2/128 |