Oyster
Maybe there are pearls inside?
How to get it
| Monster | Quantity | Rarity |
|---|---|---|
| Cave kraken | 1 | 1/91 |
| Crab | 1-2 | 1/9 |
| Dagannoth spawn | 1 | 1/6 |
| Giant lobster | 1-2 | 1/26 |
| Mogre | 1 | 1/44 |
| Mudskipper | 1 | 1/2 |
| River troll | 1 | 1/38 |
| Rock Crab | 1-2 | 1/16 |
| Sand Crab | 1-2 | 1/16 |
| Waterfiend | 1-3 | 1/135 |
Rates are per drop-table roll. A kill rolls the table one to three times, so the real per-kill chance is a little better.