Mos Le'Harmless is a pirate base surrounded by jungle that may be accessed after completing Cabin Fever. On the isle you can play a minigame called Trouble Brewing.
To get here, talk to Bill Teach on the eastern boat in Port Phasmatys or use the charter ships.
- The name "Mos Le'Harmless" alludes to the Hitchhiker's Guide to the Galaxy series by Douglas Adams, in which the guide's entry on planet earth is simply "Mostly Harmless".
- Many of the pirates, mainly those who have had some physical injury, seem to bring up an albatross in their dialogue. This may be a reference to the poem The Rime of the Ancient Mariner.