View source for Brimstone key

{{otheruses|def=no|the corresponding chest|brimstone chest}}
{{Infobox Item
|name = Brimstone key
|image = [[File:Brimstone key 1.png]] [[File:Brimstone key 2.png]] [[File:Brimstone key 3.png]] [[File:Brimstone key 4.png]] [[File:Brimstone key 5.png]] [[File:Brimstone key 10.png]] [[File:Brimstone key 20.png]]
|release = [[7 February]] [[2019]]
|update = X Marks The Spot
|members = Yes
|quest = No
|tradeable = No
|placeholder = Yes
|equipable = No
|stackable = Yes
|noteable = No
|options = Drop
|examine = Unlocks Konar's chest found atop Mount Karuulm.
|value = 80000
|alchable = No
|weight = 0.000
|id = 23083
}}
[[File:Brimstone key detail.png|left|150px]]
The '''brimstone key''' can be obtained from killing monsters while on a [[Slayer task]] given by [[Konar quo Maten]]. It is used to open the [[brimstone chest]]. The average value of a drop from the brimstone chest is {{Coins|{{KDTValue}}}} (HA: {{Coins|{{KDTAlchValue}}}}). Upon [[death]] in the [[Wilderness]], a brimstone key converts to two [[coins]] for the killer.

The probability of receiving a key as a drop increases with the slain monster's [[Combat level]]. For monsters with combat level 100 or higher, the probability is between <math>1/100</math> and <math>1/50</math>, capping at level 350. Specifically, the probability for a monster with combat level <math>L</math> is{{CiteTwitter|author=Mod Kieren|url=https://twitter.com/JagexKieren/status/1083781544135847936|date=16 January 2019|archiveurl=https://archive.is/g6A5h|archivedate=26 May 2020|quote=It follows a curve up until level 100 then scales linearly between those 2 values upto level 350 combat. Creatures over thsi{{sic}} will cap at 1/50. [https://pbs.twimg.com/media/DwpdLK2W0AEynZy.jpg]}}
:<center><math>\frac{1}{120 - \left\lfloor L/5 \right\rfloor}</math></center>
For monsters with combat level <math>L</math> smaller than level 100, the probability follows the curve{{CiteTwitter|author=Mod Kieren|url=https://twitter.com/JagexKieren/status/1083783815141707781|date=16 January 2019|archiveurl=https://archive.is/G2QQq|archivedate=29 April 2020|quote=0.2*(CBLEVEL - 100)^2 + 100}}
:<center><math>\frac{1}{100 + \left\lfloor (100 - L)^2/5 \right\rfloor}</math></center>
Additionally, if the monster has a [[Slayer]] level requirement, there is a 20% boost in the drop probability.{{CiteTwitter|author=Mod Ash|url=https://twitter.com/JagexAsh/status/1269996125387460608|date=8 June 2020|archiveurl=http://archive.is/mRtA0|archivedate=11 June 2020}}

A brimstone key is always dropped by a [[superior slayer monster]] assigned by Konar.

{{Chart data|Chart data/brimstone key drop rate|width=40vw|height=40vh}}

==Item sources==
{{Drop sources|Brimstone key}}

==Gallery==
<gallery mode="package">
Brimstone key detail.png|One brimstone key
Brimstone key 2 detail.png|Two brimstone keys
Brimstone key 3 detail.png|Three brimstone keys
Brimstone key 4 detail.png|Four brimstone keys
Brimstone key 5 detail.png|Five brimstone keys
Brimstone key 10 detail.png|Ten brimstone keys
Brimstone key 20 detail.png|Twenty brimstone keys
</gallery>

==Changes==
{{Subject changes header}}
{{Subject changes
|date = 8 May 2024
|update = Project Rebalance: Skilling & Poll 81 MTA Changes
|change = Superior slayer monsters are now guaranteed to drop brimstone keys when on a task from Konar.
}}
{{Subject changes
|date = 28 May 2020
|update = Chambers of Xeric Improvements
|poll =
|change = A bug causing the Brimstone key drop rate to be lower than intended for monsters with a combat level of 100 or higher was fixed.{{CiteTwitter|url=https://twitter.com/JagexAsh/status/1269231714586501120|archiveurl=http://archive.is/TPQQm|archivedate=8 June 2020|author=Mod Ash|date=6 June 2020|quote=Actually Mod Maylea & I had this fixed in the update before last - sorry it didn't make the newspost at the time.}}
}}
{{Subject changes footer}}

==Trivia==
*The symbol on the key is a taijitu which represents the concept of {{WP|Yin and yang}} ("<big>阴阳</big>"/"<big>陰陽</big>"), which, in Chinese philosophy, are the two "primal" elements which create, shape, and influence everything in existence and have to be kept in balance. This references the philosophy of the [[Kahlith]] and their masters, the [[Tasakaal]], which is to maintain the balance between life and death.

==References==
{{reflist}}

{{Keys}}