Gleason's Gielinor Guide

Mos Le'Harmless

Released		7 February 2006 (Update)
Also called		Mostly Harmless
Members		Yes
Location		Eastern Ocean
Inhabitants		Pirates
Teleports		Mos le'harmless teleport
Music		Life's a Beach!, Distillery Hilarity, In the Brine
Map
Advanced data
Type		island

Location on World Map
Morytania
↑
Kharidian Desert	←	Mos Le'Harmless	→	Eastern Ocean
↓
Harmony Island

Mos Le'Harmless (pronounced MOH-s lee-HARM-less) is the quaint, pirate-run free port that can be visited after completion of the Cabin Fever quest. The island has a few attractions, such as the Trouble Brewing minigame and the Mos Le'Harmless Cave, where cave horrors are found.

Players must be carrying the Book o' Piracy in their inventory to understand what the inhabitants are saying and interact with them. Otherwise, the pirates and shopkeepers will respond with a fixed script of incomprehensible pirate slang. The book, however, is not necessary to use the bank on the island.

Transportation

You must complete Cabin Fever to access the island.

Talk to Bill Teach on the eastern boat in Port Phasmatys. (Fastest way there is the ectophial.)
Use the Minigame Teleport to Trouble Brewing (requires completion of the quest and 40 Cooking).
Teleport to Harmony Island and talk to Brother Tranquility.
Mos le'harmless teleport scrolls (brings you to the north gate).
Charter ship (can be used once the quest is complete).
Red or blue rum to teleport to Trouble Brewing (costs 20 pieces of eight each).

Notable features

Trouble Brewing — A minigame that involves two teams making rum.
Mos Le'Harmless Cave — A dangerous cave filled with cave horrors. (A light source is required.)
Dodgy Mike's Second Hand Clothing — Sells pirate gear. (Trading requires carrying the Book o' Piracy.)
Two Feet Charley's Fish Shop — Sells raw fish. (Trading requires carrying the Book o' Piracy.)
Access to the bank in the port.
Access to Harmony Island via Brother Tranquility near the docks.
Slayer task monsters:
- Jungle horror
- Cave horror (requires 58 Slayer)
- Albino bat (counts toward bat assignment)
Agility shortcut — stepping stone that requires 60 Agility to use; allows for faster access to the Mos Le'Harmless Cave.
Teak/Mahogany trees (accessible from the exit at the end of the cave).

Notable citizens

Bill Teach
Brother Tranquility
Cavey Davey
Honest Jimmy
San Fan
Fancy Dan
Smith
Harpoon Joe
Charley
Patchy
Mike

Charter ship

The charter system includes a dock in Mos Le'Harmless as well as several other locations. Since travel to and from Mos Le'Harmless requires Cabin Fever to be completed, the cost of all trips is already reduced by 50%; wearing the Ring of Charos(a) can reduce the cost by an additional 50%.

Fare table		Destination
Fare table		Aldarin	Brimhaven	Catherby	Civitas illa Fortis	Corsair Cove	Deepfin Point	Karamja Shipyard	Land's End	Mos Le'Harmless	Musa Point	Port Khazard	Port Phasmatys	Port Piscarilius	Port Roberts	Port Sarim	Port Tyras	Prifddinas	Red Rock	Sunset Coast	The Pandemonium	The Summer Shore
Origin	Aldarin	N/A	2,500	2,500	600	2,100	1,200	3,100	900	2,350*	3,000	2,300	4,500	1,100	1,400	3,100	3,200	1,800	2,200	N/A	3,000	2,400
	Brimhaven	2,500	N/A	480	2,400	680	2,000	400	2,200	1,950*	480	400	2,900	2,000	3,200	1,600	3,200	3,450	1,900	2,500	400	1,900
	Catherby	2,500	480	N/A	2,400	1,000	2,200	1,600	2,200	1,250*	480	1,600	3,500	2,000	3,400	1,000	3,200	3,560	2,000	2,500	1,200	2,000
	Civitas illa Fortis	600	2,400	2,400	N/A	2,000	1,200	3,000	800	2,300*	2,900	2,200	4,400	1,000	600	3,000	3,200	1,700	2,000	500	2,800	2,200
	Corsair Cove	2,100	680	1,000	2,000	N/A	1,600	800	1,800	2,040*	800	600	4,040	1,500	2,200	1,200	3,200	1,420	1,500	2,100	800	1,600
	Deepfin Point	1,200	2,000	2,200	1,200	1,600	N/A	2,800	1,400	1,600*	2,400	1,800	3,400	1,600	1,000	2,600	3,200	1,200	1,400	1,200	2,800	1,800
	Karamja Shipyard	3,100	400	1,600	3,000	800	2,800	N/A	2,800	550*	200	1,600	3,200	2,600	3,600	400	3,200	4,000	1,600	3,100	200	1,600
	Land's End	900	2,200	2,200	800	1,800	1,400	2,800	N/A	2,200*	2,700	2,000	4,200	N/A	800	N/A	3,200	1,500	2,200	900	2,600	2,400
	Mos Le'Harmless	2,350*	1,950*	1,250*	2,300*	2,040*	1,600*	550*	2,200*	N/A	2,050*	550*	N/A	2,100*	2,200*	650*	1,600*	2,475*	1,000*	2,350*	500*	900*
	Musa Point	3,000	480	480	2,900	800	2,400	200	2,700	2,050*	N/A	400	1,100	2,500	3,500	N/A	3,200	4,400	1,700	3,000	N/A	1,700
	Port Khazard	2,300	400	1,600	2,200	600	1,800	1,600	2,000	550*	400	N/A	4,100	1,800	3,000	1,280	3,200	2,800	1,800	2,300	700	1,800
	Port Phasmatys	4,500	2,900	3,500	4,400	4,040	3,400	3,200	4,200	N/A	1,100	4,100	N/A	4,000	4,600	1,300	3,200	5,200	2,200	4,500	1,000	2,000
	Port Piscarilius	1,100	2,000	2,000	1,000	1,500	1,600	2,600	N/A	2,100*	2,500	1,800	4,000	N/A	1,000	N/A	3,200	1,200	2,400	1,100	2,400	2,600
	Port Roberts	1,400	3,200	3,400	600	2,200	1,000	3,600	800	2,200*	3,500	3,000	4,600	1,000	N/A	3,500	3,200	600	2,000	1,400	3,600	2,500
	Port Sarim	3,100	1,600	1,000	3,000	1,200	2,600	400	N/A	650*	N/A	1,280	1,300	N/A	3,500	N/A	3,200	4,800	1,700	3,100	N/A	1,700
	Port Tyras	3,200	3,200	3,200	3,200	3,200	3,200	3,200	3,200	1,600*	3,200	3,200	3,200	3,200	3,200	3,200	N/A	3,200	3,200	3,200	3,200	3,200
	Prifddinas	1,800	3,450	3,560	1,700	1,420	1,200	4,000	1,500	2,475*	4,400	2,800	5,200	1,200	600	4,800	3,200	N/A	2,000	1,800	3,800	2,200
	Red Rock	2,200	1,900	2,000	2,000	1500	1400	1600	2,200	2,000	1,700	1,800	2,200	2,400	2,000	1,700	3,200	2,000	N/A	2,200	1600	1000
	Sunset Coast	N/A	2,500	2,500	500	2,100	1,200	3,100	900	2,350*	3,000	2,300	4,500	1,100	1,400	3,100	3,200	1,800	2,200	N/A	3,000	2,400
	The Pandemonium	3,000	400	1,200	2,800	800	2,800	200	2,600	500*	N/A	700	1,000	2,400	3,600	N/A	3,200	3,800	1,600	3,000	N/A	1,600
	The Summer Shore	2,400	1,900	2,000	2,200	1,600	1,800	1,600	2,400	900*	1,700	1,800	2,000	2,600	2,500	1,700	3,200	2,200	1,000	2,400	1,600	N/A
* Since travel to and from Mos Le'Harmless requires Cabin Fever to be completed anyway, the cost is already halved.

Changes

Date	Changes
8 May 2024 (Update)	The Achievement Diary requirement has been removed from the shortcut.
24 March 2016 (Update \| poll)	Increased the density of jungle horror spawns.
5 March 2015 (Update \| poll)	There is now a level 60 Agility shortcut across the estuary on Mos Le'Harmless that can be used upon completing the hard Morytania Diary.

Trivia

Despite the name sounding like "mostly harmless" the island is in fact very dangerous due to the large quantities of jungle horrors and the dark cave with deadly monsters lurking within.
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".^[1]

References

^ Old School RuneScape. "Jagex Mods Pronounce RuneScape Words" (in 01:36 - 01:42). YouTube video. 5 June 2016.