Zombie Swab

You must have started the Rum Deal quest to fight the Zombie Swab. There is also an intimidate option.

Location

 * Rum Island

Drops

 * Coins (10-40)
 * Chaos runes (4)
 * Water runes (17)
 * Cosmic runes (2)
 * Herbs
 * Karamthulhu
 * Fishing bait (7)
 * Rusty scimitar
 * Steel scimitar