Horrors lurk in the depths.
The Mos Le'Harmless Caves, also called the "Cave of Horrors", are found on Mos Le'Harmless, which players can reach only after completing the Cabin Fever quest. A light source is required in the caves. In the north-east, two staircases ascend to small islands with teak and mahogany trees and seaweed spawns. The caves are the only place where Cave horrors and Albino bats are found.
- Level 77 Cave horrors (level 58 Slayer and a Witchwood icon needed to fight). They are scattered around the cave and are aggressive.
- Level 105 Unspeakable horror (level 58 Slayer and a Witchwood icon needed to fight). They are found on north-eastern part of the cave and are aggressive.
- Level 43 Albino bats. These are rarely fought because they have no drops, and mainly serve as an annoyance to players who wish to fight the horrors.
- Cavey Davey guards the entrance to the caves. He warns players to be prepared before entering.
- The music "Little Cave of Horrors" is a reference to the film Little Shop of Horrors.
- Cave horrors are regarded as having good drops. They occasionally drop prized Black masks, which enhance players' abilities on Slayer assignments and are used to make Slayer helmets.
- The "teak and mahogany" islands are rarely used for Woodcutting, given their distance from a bank and the need to cross the caves. Both regular Seaweed and Edible seaweed are found on the islands.
Tiles with pictures resembling black masks on them.
- The name is a play on words, Mos Le'Harmless. Mostly Harmless which is a reference to the book, movie and radio show 'The Hitch Hiker's Guide to the Galaxy'.
- Mos Le'Harmless is also a map type in the Funorb Game Arcanists.
- When a player enters the Mos Le'Harmless Caves, they have two options before entering should they not have a Witchwood icon. The option for entering says, 'Yes, I am not afraid to be killed in nasty ways', a reference to the song 'Brave Sir Robin' in Monty Python and the Holy Grail.
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| Asgarnia |
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| Kandarin |
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| Karamja |
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| Kharidian Desert |
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| Misthalin |
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| Morytania |
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| Fremennik Province |
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| Feldip Hills |
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| Wilderness |
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| Troll Country & The North |
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| Keldagrim |
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| Tirannwn & Galarpos |
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| Elite dungeons |
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| Others |
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