Mos Le Harmless OSRS: A Complete Guide to the Island

Mos Le Harmless OsrsSource:

Are you looking for a new adventure in Old School RuneScape? Look no further than Mos Le Harmless, the pirate island located in the southern part of the game’s world. This island is full of unique activities, challenging bosses, and valuable rewards. In this guide, we’ll explore everything you need to know about Mos Le Harmless OSRS.

Getting to Mos Le Harmless

Mos Le Harmless Osrs MapSource:

First things first, how do you get to Mos Le Harmless? The island is only accessible by boat, and the closest dock is located in Port Phasmatys, a town on the eastern coast of Morytania. To reach Port Phasmatys, you must complete the Ghosts Ahoy quest, which requires level 25 Agility, Cooking, Crafting, and Herblore. Once you’ve completed the quest, you can travel to Port Phasmatys and talk to the ghost captain to sail to Mos Le Harmless.

Activities on Mos Le Harmless

Mos Le Harmless PirateSource:

Mos Le Harmless is a pirate island, so it’s no surprise that many of the activities on the island are pirate-themed. Here are some of the things you can do on Mos Le Harmless:

Pirate Training Arena

Pirate Training ArenaSource:

The Pirate Training Arena is a mini-game where you can train your combat skills against various pirate enemies. The game rewards you with pirate-themed items and experience in combat skills.

Rum Deal Quest

Rum Deal QuestSource:

The Rum Deal quest is a challenging quest that requires level 42 Crafting, level 50 Fishing, and level 47 Prayer. The quest involves brewing a special batch of rum that can cure the residents of Mos Le Harmless from a deadly disease.

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Spooky Slayer Dungeon

Spooky Slayer DungeonSource:

The Spooky Slayer Dungeon is a dungeon filled with spooky monsters that require high Slayer levels to defeat. The dungeon rewards players with valuable loot and Slayer experience.

Bosses on Mos Le Harmless

Mos Le Harmless BossSource:

Mos Le Harmless is also home to several challenging bosses that require high combat levels and specialized equipment to defeat. Here are some of the bosses you may encounter on Mos Le Harmless:

Motherlode Maw

Motherlode MawSource:

The Motherlode Maw is a giant sea monster that can be defeated by players with level 75 Slayer. The monster drops valuable loot, including the Tome of Water, which is required to cast the Water Wave spell.



Har-Aken is a giant TokHaar monster that can be defeated by players who have completed the Fight Kiln minigame. The monster is very difficult to defeat and requires high combat levels and specialized equipment.


Mos Le Harmless OSRS is a unique and challenging destination for adventurous players. Whether you’re looking to train your combat skills, complete challenging quests, or defeat powerful bosses, Mos Le Harmless has something for everyone. So grab your pirate gear and set sail for this exciting island today!

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