| Iorwerth scout [] | 1 | 1/128,000 |
| Irina [] | 1 | 1/33,554,432 |
| Iron dragon [] | 1 | 1/118,926.62 |
| Jade the Unruly (Normal mode) [] | 1 | 1/76,800 |
| Jelly [] | 1 | 1/4,194,304 |
| Jennella [] | 1 | 1/33,554,432 |
| Jeroen [] | 1 | 1/33,554,432 |
| Jogre [] | 1 | 1/8,454,144 |
| Jogre [] | 1 | 1/8,454,144 |
| Joseph [] | 1 | 1/33,554,432 |
| Jungle strykewyrm [] | 1 | 1/1,654,784 |
 K'ril Tsutsaroth (Senntisten)[] | 1 | 1/32,513.98 |
| Kal'gerion demon [] | 1 | 1/51,200 |
| Kal'gerion demon (The Shadow Reef) (Normal mode) [] | 1 | 1/76,800 |
| Kalphite Guardian [] | 1 | 1/1,677,721.6, 2 rolls |
| Kalphite Guardian [] | 1 | 1/128,000 |
| Kalphite King [] | 1 | 1/25,600, 3 rolls |
| Kalphite Queen [] | 1 | 1/762,600.73, 4 rolls |
| Kalphite Soldier [] | 1 | 1/2,097,152 |
| Kalphite Worker [] | 1 | 1/4,194,304 |
| Killerwatt [] | 1 | 1/4,194,304 |
| King Black Dragon (Members) [] | 1 | 1/110,702.7 |
 Kingly impling[] | 1 | 1/101 |
| Kingly impling jar [] | 1 | 1/101 |
| Knight of Ardougne [] | 1 | 1/1,677,721.6 |
| Kraka [] | 1 | 1/1,677,721.6 |
| Kree'arra (Hard mode) [] | 1 | 1/51,200 |
| Kree'arra (Normal) [] | 1 | 1/50,582.54 |
| Ksenia [] | 1 | 1/33,554,432 |
| Laboratory slime (Big (Normal mode)) [] | 1 | 1/76,800 |
| Lady Himiko (Normal mode) [] | 1 | 1/76,800 |
| Lampenflora [] | 1 | 1/51,200 |
| Lanzig [] | 1 | 1/33,554,432 |
| Lava spider (Normal mode) [] | 1 | 1/76,800 |
| Lava strykewyrm [] | 1 | 1/51,200 |
| Lava strykewyrm (Dragonkin Laboratory) (Normal mode) [] | 1 | 1/76,800 |
| Lensa [] | 1 | 1/33,554,432 |
| Lesser demon [] | 1 | 1/699,050.67 |
| Lesser demon [] | 1 | 1/699,050.67 |
| Lesser demon [] | 1 | 1/699,050.67 |
| Lesser reborn mage [] | 1 | 1/936,228.57 |
| Lesser reborn ranger [] | 1 | 1/936,228.57 |
| Lesser reborn warrior [] | 1 | 1/936,228.57 |
| Lev [] | 1 | 1/33,554,432 |
| Liliya [] | 1 | 1/33,554,432 |
| Liverworts [] | 1 | 1/51,200 |
| Lizard [] | 1 | 1/1,677,721.6 |
| Locust lancer [] | 1 | 1/599,186.29, 2 rolls |