They drop herbs, fire runes, noted iron ore, nature runes and dust runes. Mages and rangers can easily safespot them.
To kill them, go to the second level of the Stronghold of Security, and then head south into the large room containing them. Note: Do not kill Flesh Crawlers on a free-to-play server because you can only get body runes and iron ore from them. The latter is a very fast skill that unlocks many very effective money-making methods that require little-to-no startup costs or supplies, thus making it an ideal stat for Ironman accounts or players without a large bank. Members, on the other hand, have access to an additional money-maker in the Hunter skill as well as an array of other content like high-level Runecrafting and Thieving. These three skills (Woodcutting, Fishing, and Mining) are known as the 'Big Three', and they have been the three primary money-making skills commonly used by players to make money in RuneScape.
Main article: Money making guide/SkillingAnother way to start making some gold pieces is by levelling up a skill such as Woodcutting, Fishing, or Mining.