| Ancient warrior [] | 1 | 1/2,867.2 |
| Ancient warrior [] | 45–55 | 1/3,303,014.4 |
| Angry barbarian spirit [] | 1 | 1/6,997.33 |
| Angry barbarian spirit [] | 45–55 | 1/8,060,928 |
| Animated book (Dragonkin Laboratory) (Normal mode) [] | 1 | 1/1,200 |
| Animated book (Dragonkin Laboratory) (Normal mode) [] | 45–55 | 1/153,600 |
| Ankou [] | 1 | 1/2,427.26 |
| Ankou [] | 45–55 | 1/2,796,202.67 |
| Ankou [] | 1 | 1/1,061.93, 3 rolls |
| Ankou [] | 45–55 | 1/1,223,338.67, 3 rolls |
| Aquanite [] | 1 | 1/2,000 |
| Aquanite [] | 45–55 | 1/256,000 |
| Aquanite [] | 1 | 1/800, 3 rolls |
| Aquanite [] | 45–55 | 1/102,400, 3 rolls |
| Arch-Glacor (Hard mode) [] | 75 | Common |
| Arch-Glacor (Normal mode (2 mechs.)) [] | 3–5 | 20/200, 3 rolls |
| Arch-Glacor (Normal mode (2 mechs.)) [] | 20 | 1/400, 3 rolls |
| Arch-Glacor (Normal mode (3 mechs.)) [] | 4–7 | 20/200, 3 rolls |
| Arch-Glacor (Normal mode (3 mechs.)) [] | 20 | 1/400, 3 rolls |
| Arch-Glacor (Normal mode (4 mechs.)) [] | 6–10 | 20/200, 3 rolls |
| Arch-Glacor (Normal mode (4 mechs.)) [] | 20 | 1/400, 3 rolls |
| Arch-Glacor (Normal mode (5 mechs.)) [] | 10–17 | 20/200, 3 rolls |
| Arch-Glacor (Normal mode (5 mechs.)) [] | 20 | 1/400, 3 rolls |
| Arhat (Normal mode) [] | 1 | 1/1,200 |
| Arhat (Normal mode) [] | 45–55 | 1/153,600 |
| Arhat paragon (Normal mode) [] | 1 | 1/1,200 |
| Arhat paragon (Normal mode) [] | 45–55 | 1/153,600 |
| Armadylean shaman [] | 1 | 1/1,040.25 |
| Armadylean shaman [] | 45–55 | 1/1,198,372.57 |
| Armoured phantom [] | 2 | 8/100 |
 Armoured zombie (Defender of Varrock)[] | 1 | 1/14,563.56 |
| Armoured zombie (Defender of Varrock) [] | 45–55 | 1/16,777,216 |
| Armoured zombie (Normal mode) [] | 1 | 1/1,200 |
| Armoured zombie (Normal mode) [] | 45–55 | 1/153,600 |
 Arrg (Scratched)[] | 1 | 1/2,912.71 |
| Arrg (Scratched) [] | 45–55 | 1/3,355,443.2 |
| Astellarn (Normal mode) [] | 1 | 1/1,200 |
| Astellarn (Normal mode) [] | 45–55 | 1/153,600 |
| Asuran Arsenal [] | 10–20 | 50/1,000 |
| Automaton (Heart of Gielinor) [] | 1 | 1/2,821.69 |
| Automaton (Heart of Gielinor) [] | 45–55 | 1/3,250,585.6 |
| Automaton champion [] | 1 | 1/2,753.42 |
| Automaton champion [] | 45–55 | 1/3,171,942.4 |
| Automaton Generator [] | 1 | 1/2,560 |
| Automaton Generator [] | 45–55 | 1/2,949,120 |
| Automaton Guardian [] | 1 | 1/2,560 |
| Automaton Guardian [] | 45–55 | 1/2,949,120 |
| Automaton Tracer [] | 1 | 1/2,560 |