| Chest (Rogues' Castle) [] | 1 | Common |
| Cloaked zealot (Normal mode) [] | 1 | 1/1,200 |
| Cloaked zealot (Normal mode) [] | 45–55 | 1/153,600 |
| Cloaked zealot (Normal mode) [] | 1 | 1/1,200 |
| Cloaked zealot (Normal mode) [] | 45–55 | 1/153,600 |
| Cockatrice [] | 1 | 1/7,281.78 |
| Cockatrice [] | 45–55 | 1/8,388,608 |
| Cockroach drone [] | 1 | 1/2,427.26 |
| Cockroach drone [] | 45–55 | 1/2,796,202.67 |
| Cockroach soldier [] | 1 | 1/2,080.51 |
| Cockroach soldier [] | 45–55 | 1/2,396,745.14 |
| Cockroach worker [] | 1 | 1/2,912.71 |
| Cockroach worker [] | 45–55 | 1/3,355,443.2 |
| Commander Zilyana (Hard mode) [] | 1 | 1/800 |
| Commander Zilyana (Hard mode) [] | 45–55 | 1/102,400 |
| Commander Zilyana (Normal mode) [] | 1 | 1/720.81 |
| Commander Zilyana (Normal mode) [] | 45–55 | 1/101,165.07 |
| Cooper (Normal mode) [] | 1 | 1/1,200 |
| Cooper (Normal mode) [] | 45–55 | 1/153,600 |
| Corporeal Beast [] | 1 | 1/5,825.42, 10 rolls |
| Corporeal Beast [] | 45–55 | 1/6,710,886.4, 10 rolls |
| Corrupted dust devil [] | 1 | 1/1,200 |
| Corrupted dust devil [] | 45–55 | 1/153,600 |
| Corrupted kalphite guardian [] | 1 | 1/1,200 |
| Corrupted kalphite guardian [] | 45–55 | 1/153,600 |
| Corrupted kalphite marauder [] | 1 | 1/1,200 |
| Corrupted kalphite marauder [] | 45–55 | 1/153,600 |
| Corrupted lizard [] | 1 | 1/1,200 |
| Corrupted lizard [] | 45–55 | 1/153,600 |
| Corrupted scarab [] | 1 | 1/1,200 |
| Corrupted scarab [] | 45–55 | 1/153,600 |
| Corrupted scorpion [] | 1 | 1/1,200 |
| Corrupted scorpion [] | 45–55 | 1/153,600 |
| Corrupted worker [] | 1 | 1/1,200 |
| Corrupted worker [] | 45–55 | 1/153,600 |
| Crassian Leviathan (Normal mode) [] | 1 | 1/1,200 |
| Crassian Leviathan (Normal mode) [] | 45–55 | 1/153,600 |
| Crassian scout (Normal mode) [] | 1 | 1/1,200 |
| Crassian scout (Normal mode) [] | 45–55 | 1/153,600 |
| Crassian scuttler (Normal mode) [] | 1 | 1/1,200 |
| Crassian scuttler (Normal mode) [] | 45–55 | 1/153,600 |
| Crassian warrior (Normal mode) [] | 1 | 1/1,200 |
| Crassian warrior (Normal mode) [] | 45–55 | 1/153,600 |
| Crawling hand [] | 1 | 1/7,281.78 |
| Crawling hand [] | 45–55 | 1/8,388,608 |
| Crocodile akh [] | 1 | 1/1,200 |
| Crocodile akh [] | 45–55 | 1/153,600 |
| Croesus (Active) [] | 10–14 | 25/1,000 |