Brimstone chest

ClosedOpened

Brimstone chest
Released								7 February 2019 (Update)
Members								Yes
Quest								No
Location								Mount Karuulm
League region								Kourend✓
Options								Unlock, Check
Examine								It looks as though only a special key would unlock this chest.
Map
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Advanced data
Object ID								34660

Brimstone chest? (edit)? (edit)File:Brimstone chest.pngFile:Brimstone chest (opened).png7 February 2019 (Update)? (edit)? (edit)YesNoMount Karuulm Kourend✓Kourend? (edit)Unlock, CheckNone? (edit)? (edit)? (edit)It looks as though only a special key would unlock this chest.You unlocked this chest with a special key.<mapframe align="center" frameless="" plane="0" width="300" y="3785" x="1309" height="300" zoom="2" mapID="0"> {"features":[{"type":"Feature","geometry":{"coordinates":[[[1306,3782],[1306,3788],[1312,3788],[1312,3782]]],"type":"Polygon"},"properties":{"mapID":0,"plane":"0","description":"

X/Y: 1309,3785

"}}],"type":"FeatureCollection"} </mapframe>DEFAULT,DEFAULT,DEFAULTScenery? (edit)3466034661? (edit)3466034661? (edit)? (edit)Versions: 2

SMW Subobject for OpenedLeague Region: KourendImage: File:Brimstone chest (opened).pngUses infobox: SceneryObject ID: 34661Release date: 7 February 2019Is members only: trueIs variant of: Brimstone chest

SMW Subobject for ClosedLeague Region: KourendImage: File:Brimstone chest.pngUses infobox: SceneryObject ID: 34660Release date: 7 February 2019Is members only: trueIs variant of: Brimstone chest

The Brimstone chest is located adjacent to Konar quo Maten on Mount Karuulm. This chest is locked and can only be opened by using a brimstone key, which players can acquire from slaying monsters assigned by Konar.

The likelihood of obtaining the key is 1/100 for level 100 monsters and 1/50 for level 350 monsters, scaling linearly and capping at 350 as shown in formula 2. For lower level monsters, it follows a curve as shown in formula 1.

${\begin{aligned}P(L)&={\frac {1}{100+\lfloor (100-L)^{2}/5\rfloor }}&L\in (0,100)&&(1)\\P(L)&={\frac {1}{120-\lfloor L/5\rfloor }}&L\in [100,350]&&(2)\end{aligned}}$

${\text{Where P is the probability of a drop and L is the monster's combat level.}}$

Possible Loot

Drop rates estimated based on 787,160 samples from the Drop Rate Project, unless otherwise cited.

The contents of the brimstone chest generally consist of generic loot designed to increase player profits. There is also a rare chance of obtaining a broken dragon hasta, which can be repaired for free by simply showing it to Otto Godblessed. Additionally, there's a slim chance of acquiring pieces of the dusk mystic robe set, featuring a colour scheme similar to that of Mount Karuulm.

On average, a player would need to open the Brimstone Chest approximately 2,284 times to acquire at least one of each dusk mystic piece and at least one Broken dragon hasta to fulfil the respective collection log slots.

The average value of a drop from this table is 101,976.56.

	Item	Quantity	Rarity	Price	High Alch
	Uncut diamond	25–35 (noted)	1/12	53,550–74,970	3,000–4,200
	Uncut ruby	25–35 (noted)	1/12	24,700–34,580	1,500–2,100
	Coal	300–500 (noted)	1/12	45,600–76,000	8,100–13,500
	Coins	50,000–150,000	1/12	50,000–150,000	50,000–150,000
	Gold ore	100–200 (noted)	1/15	15,700–31,400	9,000–18,000
	Dragon arrowtips	50–200	1/15	89,500–358,000	15,000–60,000
	Iron ore	350–500 (noted)	1/20	73,150–104,500	3,500–5,000
	Rune full helm	2–4 (noted)	1/20	41,066–82,132	42,240–84,480
	Rune platebody	1–2 (noted)	1/20	38,507–77,014	39,000–78,000
	Rune platelegs	1–2 (noted)	1/20	37,847–75,694	38,400–76,800
	Raw tuna	100–350 (noted)	Varies	5,900–20,650	2,400–8,400
	Raw lobster	100–350 (noted)	Varies	7,400–25,900	4,200–14,700
	Raw swordfish	100–300 (noted)	Varies	9,800–29,400	4,800–14,400
	Raw monkfish	100–300 (noted)	Varies	19,900–59,700	13,800–41,400
	Raw shark	100–250 (noted)	Varies	62,300–155,750	10,200–25,500
	Raw sea turtle	80–200 (noted)	Varies	78,960–197,400	9,600–24,000
	Raw manta ray	80–160 (noted)	Varies	145,280–290,560	9,600–19,200
	Runite ore	10–15 (noted)	1/30	110,250–165,375	19,200–28,800
	Steel bar	300–500 (noted)	1/30	156,300–260,500	18,000–30,000
	Magic logs	120–160 (noted)	1/30	125,520–167,360	23,040–30,720
	Dragon dart tip	40–160	1/30	126,520–506,080	6,000–24,000
Palm tree seed.png: Brimstone chest drops Palm tree seed with rarity 1/60 in quantity 2-4	Palm tree seed	2–4	1/60	72,706–145,412	304–608
Magic seed.png: Brimstone chest drops Magic seed with rarity 1/60 in quantity 2-4	Magic seed	2–4	1/60	194,576–389,152	506–1,012
Celastrus seed.png: Brimstone chest drops Celastrus seed with rarity 1/60 in quantity 2-4	Celastrus seed	2–4	1/60	138,642–277,284	648–1,296
Dragonfruit tree seed.png: Brimstone chest drops Dragonfruit tree seed with rarity 1/60 in quantity 1-4	Dragonfruit tree seed	1–4	1/60	175,577–702,308	258–1,032
Redwood tree seed.png: Brimstone chest drops Redwood tree seed with rarity 1/60 in quantity 1	Redwood tree seed	1	1/60	20,284	390
Torstol seed.png: Brimstone chest drops Torstol seed with rarity 1/60 in quantity 3-5	Torstol seed	3–5	1/60	19,143–31,905	126–210
Snapdragon seed.png: Brimstone chest drops Snapdragon seed with rarity 1/60 in quantity 3-5	Snapdragon seed	3–5	1/60	124,977–208,295	108–180
Ranarr seed.png: Brimstone chest drops Ranarr seed with rarity 1/60 in quantity 3-5	Ranarr seed	3–5	1/60	81,894–136,490	90–150
	Pure essence	3,000–6,000 (noted)	1/60	3,000–6,000	6,000–12,000
	Broken dragon hasta	1	1/200	42,477	37,440
	Mystic hat (dusk)	1	1/1,000	31,199	9,000
	Mystic robe top (dusk)	1	1/1,000	91,451	72,000
	Mystic robe bottom (dusk)	1	1/1,000	83,634	48,000
	Mystic gloves (dusk)	1	1/1,000	19,230	6,000
	Mystic boots (dusk)	1	1/1,000	45,854	6,000

Fish Drop Table

If one lands the 1/20 chance to hit the fish drop table, sequential rolls are made until one succeeds, starting with raw manta rays and ending with raw lobsters in case all rolls fail.

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Comparison

Chest	Key		Average loot value
Brimstone chest	File:Brimstone key.png	Brimstone key	101,976.56
Larran's big chest	File:Larran's key.png	Larran's key	0
Larran's small chest	File:Larran's key.png	Larran's key	0

Changes

For changes in the drop table contents, see here.

Date	Changes
[[{{#explode:14 March 2019| |0}} {{#explode:14 March 2019| |1}}]] [[{{#explode:14 March 2019| |2}}]] (update | poll)	The brimstone chest now tracks the amount of times the player has opened it.
[[{{#explode:21 February 2019| |0}} {{#explode:21 February 2019| |1}}]] [[{{#explode:21 February 2019| |2}}]] (update)	Loot obtained from the chest is now broadcasted in the chatbox to players within the vicinity.

Trivia

• Several items can be seen inside the brimstone chest while it is open, including piles of coins, stacks of bank notes, and vials of Saradomin brew. This is a reference to the loot players can receive from the chest, although Saradomin brews were removed from Konar's drop table shortly after release.