Brine rat

Brine rats are Slayer monsters that require you to start Olaf's quest. A slayer level of 47 is required to fight the Brine rat. The Brine rats are relatively weak, but can still hit up to 9. There are also some safe spots for rangers and mages. If you bring a tinderbox and logs you can cook their meat to fight them longer, if you are doing slayer. Also, there is a fire (tended by Olaf Hradson) located just outside of the cavern's exit which provides an excellent location to cook either the rat meat or dropped seafood. They also drop the brine sabre which has a special attack, liquify, that only works underwater.

Locations

 * Brine Rat Cavern, found during Olaf's Quest

100% drops

 * Bones
 * Raw rat meat

Other drops

 * Charms : Gold, Green, Crimson (uncommon), and Blue (rare)
 * 18 Raw rat meat (noted)
 * 1, 2, 4, 29, or 30 Coins
 * 10 Raw lobster (noted)
 * 3 or 8 Raw shark (noted)
 * 18 Raw pike (noted)
 * unnoted raw shark (uncommon)
 * unnoted raw swordfish (9)
 * 10, 18, or 36 Earth runes
 * 10 or 18 Water runes
 * 18 Air runes
 * 7 Death runes (Fairly common)
 * 4 Blood runes (uncommon)
 * Chaos rune
 * Water talisman
 * Brine sabre (rare drop)