| Requirements | |
|---|---|
| Skills | |
 58  70 ,  ,  or  50 (Along with 70 Defence) recommended | |
| Items | |
| |
| Quest | |
| Cabin Fever | |
| Other | |
| Unlocked the Trouble Brewing minigame teleport (optional) | |
| Results | |
| Profit | Experience gained |
| 1,033,230, after tax |  66,000  21,999 16,500 |
| Inputs | Outputs (1,033,230, after tax) |
0.59 ×  Black mask (10) (782,151)7.03 ×  Mithril axe (1,048)2.34 ×  Rune dagger (10,493)2.34 ×  Adamant full helm (4,343)2.34 ×  Mithril kiteshield (2,484)138 ×  Nature rune (23,231)7.61 ×  Grimy guam leaf (1,416)5.71 ×  Grimy marrentill (1,040)4.29 ×  Grimy tarromin (506)3.33 ×  Grimy harralander (930)2.62 ×  Grimy ranarr weed (13,500)1.9 ×  Grimy irit leaf (2,349)1.43 ×  Grimy avantoe (1,878)1.19 ×  Grimy kwuarm (2,116)0.95 ×  Grimy cadantine (1,937)0.71 ×  Grimy lantadyme (863)0.71 ×  Grimy dwarf weed (940)8.4 ×  Toadflax seed (8,067)3.93 ×  Avantoe seed (1,372)2.68 ×  Kwuarm seed (5,263)1.79 ×  Snapdragon seed (76,695)1.25 ×  Cadantine seed (6,299)2.69 ×  Snape grass seed (39,874)0.36 ×  Torstol seed (5,418)16.41 ×  Limpwurt root (3,691)65.63 ×  Teak logs (7,613)14.06 ×  Mahogany logs (2,138)10 ×  Ensouled horror head (13,130)7,631 ×  Coins (7,631)11.72 ×  Gem drop table (4,815) | |
The profit rate assumes 300 kills per hour. Your actual profit may be higher or lower depending on your speed. Upwards of 550 can be killed per hour making use of a dwarf multicannon.
Cave horrors, requiring 58 Slayer to kill, drop the black mask, worth 1,362,113, at a 1/512 rate. They are located in the Mos Le'Harmless Cave, which requires Cabin Fever to be completed. Also, players will need a light source and a witchwood icon to avoid taking a great deal of damage. The easiest way to get to the caves would be teleporting to Port Phasmatys via the Ectophial and taking Bill Teach's boat to Mos Le'Harmless and travelling east from the town. Afterwards, be sure to unlock the Trouble Brewing minigame teleport once you arrive so that you may return with ease.
The cave horrors are a bit spread out, but they possess low Defence and only have 55 Hitpoints, so it's easy to take them down with any combat class. Ranged or Melee is preferred; however, there is a safespot near the entrance for rangers to use. With a good weapon and decent armour, they don't do enough damage to be very troublesome. They have very few drops besides the black mask worth picking up, although nature runes, various alchables, and herb seeds may be worth picking up. At this rate, you should average about one black mask every hour and a half, although this is not at all guaranteed.
Using Protect from Melee can nullify all damage taken, including damage from their special attacks, removing the need for wearing a Witchwood icon and allowing the player to wear a necklace with offensive bonuses instead.
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