 K'ril Tsutsaroth (Senntisten)[] | 1 | 1/812.85 |
| K'ril Tsutsaroth (Senntisten) [] | 18–22 | 1/43,351.98 |
| K'ril Tsutsaroth (Hard mode) [] | 2 | 11/128 |
| Kal'gerion demon [] | 1 | 10/256 |
| Kal'gerion demon [] | 1 | 1/1,280 |
| Kal'gerion demon [] | 18–22 | 1/68,266.67 |
| Kal'gerion demon (The Shadow Reef) (Normal mode) [] | 1 | 1/1,920 |
| Kal'gerion demon (The Shadow Reef) (Normal mode) [] | 18–22 | 1/102,400 |
| Kalphite Guardian [] | 1 | 1/41,943.04, 2 rolls |
| Kalphite Guardian [] | 18–22 | 1/2,236,962.13, 2 rolls |
| Kalphite Guardian [] | 1 | 1/3,200 |
| Kalphite Guardian [] | 18–22 | 1/170,666.67 |
| Kalphite King [] | 1 | 1/640, 3 rolls |
| Kalphite King [] | 18–22 | 1/34,133.33, 3 rolls |
| Kalphite Queen [] | 1 | 1/19,065.02, 4 rolls |
| Kalphite Queen [] | 18–22 | 1/1,016,800.97, 4 rolls |
| Kalphite Soldier [] | 1 | 1/52,428.8 |
| Kalphite Soldier [] | 18–22 | 1/2,796,202.67 |
| Kalphite Worker [] | 1 | 1/104,857.6 |
| Kalphite Worker [] | 18–22 | 1/5,592,405.33 |
| Killerwatt [] | 1 | 1/104,857.6 |
| Killerwatt [] | 18–22 | 1/5,592,405.33 |
| King Black Dragon (Free-to-play) [] | 1 | 5/100 |
| King Black Dragon (Free-to-play) [] | 1 | 1/3,200 |
| King Black Dragon (Members) [] | 1 | 5/100 |
| King Black Dragon (Members) [] | 1 | 1/2,767.57 |
| King Black Dragon (Members) [] | 18–22 | 1/147,603.6 |
| Knight of Ardougne [] | 1 | 1/41,943.04 |
| Knight of Ardougne [] | 18–22 | 1/2,236,962.13 |
| Kraka [] | 1 | 1/41,943.04 |
| Kraka [] | 18–22 | 1/2,236,962.13 |
| Kree'arra (Hard mode) [] | 2 | 8/128 |
| Kree'arra (Hard mode) [] | 1 | 1/1,280 |
| Kree'arra (Hard mode) [] | 18–22 | 1/68,266.67 |
| Kree'arra (Normal) [] | 1 | 1/1,264.56 |
| Kree'arra (Normal) [] | 18–22 | 1/67,443.38 |
| Ksenia [] | 1 | 1/838,860.8 |
| Ksenia [] | 18–22 | 1/44,739,242.67 |
| Laboratory slime (Big (Normal mode)) [] | 1 | 1/1,920 |
| Laboratory slime (Big (Normal mode)) [] | 18–22 | 1/102,400 |
| Lady Himiko (Normal mode) [] | 1 | 1/1,920 |
| Lady Himiko (Normal mode) [] | 18–22 | 1/102,400 |
| Lampenflora [] | 1 | 1/1,280 |
| Lampenflora [] | 18–22 | 1/68,266.67 |
| Lanzig [] | 1 | 1/838,860.8 |
| Lanzig [] | 18–22 | 1/44,739,242.67 |
| Lava spider (Normal mode) [] | 1 | 1/1,920 |
| Lava spider (Normal mode) [] | 18–22 | 1/102,400 |