Thermonuclear smoke devil

This article is about the boss. For the Slayer monster, see Smoke devil.

Not to be confused with Nuclear smoke devil.

This article has a strategy guide here. All information on mechanics and strategy will be on this page.

This article has a money making guide here: Killing the Thermonuclear smoke devil. Please add tips to the subpage, rather than the article below.

This article has a Slayer task guide here. Information comparing locations for Slayer tasks will be on this page

Thermonuclear smoke devil
Released										10 April 2014 (Update)
Members										Yes
Combat level										301
Size										4x4
Examine										Woah.
Combat info
Max hit										8
Aggressive										No
Poison										No
Attack style										Typeless Magical ranged
Attack speed
Respawn time										15 ticks (9 seconds)
Slayer info
Slayer level										93
Slayer XP										240 xp
Category										Bosses, Smoke Devils
Assigned by
Combat stats
240					230					220					360					1					310
Aggressive stats
+0					+0					+0					+0					+0					+0
Defensive stats
+11						+4						+9						+800						+900
Immunities
Poison										Immune
Venom										Immune
Cannons										Not immune
Thralls										Not immune
Advanced data
Monster ID												499

The thermonuclear smoke devil, often referred to as Thermy, is the boss version of the smoke devil, found in the Smoke Devil Dungeon. It requires a minimum of 93 Slayer to damage. Located at the Smoke Devil Dungeon south of Castle Wars, the Thermonuclear smoke devil can only be attacked on a smoke devil task, with the exception of one kill for the Western Provinces Diary (provided that the player has 93 Slayer without boosting).

It is the only monster to drop the Smoke battlestaff, Jar of smoke and the pet smoke devil. It drops the occult necklace at a higher rate than smoke devils do.

Unlike most NPCs, the Thermonuclear smoke devil is always able to walk through other monsters/players. This is to prevent players from safespotting the boss using the smoke devils found in its lair.

A dwarf multicannon cannot be used inside the boss room. If it is set up, the cannon will be destroyed (as in the lairs of the KBD and KQ).

Location

Location	Levels	Members	Spawns	Map
Smoke Devil Dungeon	301		1	Maplink

Drops

Drop rates estimated based on 1,059,303 kills from the Drop Rate Project, unless otherwise cited.

The average Thermonuclear smoke devil kill is worth 21,687.73.

The average Thermonuclear smoke devil kill while on a Konar task is worth 23,774.14.

100%

	Item	Quantity	Rarity	Price	High Alch
	Ashes	1	Always	57	1

Weapons and armour

	Item	Quantity	Rarity	Price	High Alch
	Rune dagger	1	5/107	4,448	4,800
	Rune chainbody	1	4/107	29,515	30,000
	Red d'hide body	1	3/107	6,032	6,738
	Rune battleaxe	1	3/107	24,515	24,960
	Mystic air staff	1	3/107	25,166	25,500
	Mystic fire staff	1	3/107	25,101	25,500
	Rune scimitar	1	2/107	14,982	15,360
	Rune knife(p++)	50	1/107	12,200	4,950
	Dragon scimitar	1	1/107	59,539	60,000
	Ancient staff	1	1/107	59,722	60,000
	Occult necklace	1	1/350	223,649	27,000
	Smoke battlestaff	1	1/512	998,806	9,300
	Dragon chainbody	1	1/2,000	150,950	150,000

Runes and ammunition

	Item	Quantity	Rarity	Price	High Alch
	Smoke rune	100	10/107	5,500	1,200
	Air rune	300	8/107	1,500	600
	Soul rune	60	8/107	9,360	10,800
	Rune arrow	100	2/107	3,900	24,000

Consumables

	Item	Quantity	Rarity	Price	High Alch
	Ugthanki kebab	3	1/107	1,800	36
	Tuna potato	3	3/107	3,672	201
	Sanfew serum(4)	2	3/107	47,138	360
	Prayer potion(4)	2	1/107	17,326	228

Resources

	Item	Quantity	Rarity	Price	High Alch
	Pure essence	300 (noted)	2/107	600	600
	Molten glass	100 (noted)	2/107	10,300	100
	Mithril bar	20 (noted)	2/107	13,180	3,600
	Coal	150 (noted)	2/107	27,750	4,050
	Magic logs	20 (noted)	2/107	19,960	3,840
	Gold ore	200 (noted)	2/107	38,600	18,000
	Diamond	10 (noted)	1/107	19,000	12,000

Other

	Item	Quantity	Rarity	Price	High Alch
	Coins	10,000–20,000	15/107	10,000–20,000	10,000–20,000
	Tinderbox	1	1/107	68	0
	Fire talisman	1	1/107	5,400	2
	Bullseye lantern	1	1/107	895	252
	Desert goat horn	50 (noted)	2/107	1,700	350
	Grimy toadflax	15 (noted)	2/107	31,725	165
	Onyx bolt tips	12	2/107	101,424	7,200
	Snapdragon seed	2	2/107	108,370	72
	Grapes	100 (noted)	1/107	2,300	0
	Magic seed	1	1/107	173,174	253
	Dragonstone ring	1	1/107	11,975	10,575
	Crystal key	1	1/107	21,161	90

Gem drop table

There is a 2/107 chance of rolling the gem drop table.

	Item	Quantity	Rarity	Price	High Alch
	Nothing	N/A	1/107.2; Never	N/A	N/A
	Uncut sapphire	1	1/214; 1/108.67	378	15
	Uncut emerald	1	1/428; 1/217.34	636	30
	Uncut ruby	1	1/856; 1/434.69	1,359	60
	Nature talisman	1	1/2,282.67; 1/1,159.17	904	2
	Uncut diamond	1	1/3,424; 1/1,738.75	2,759	120
	Loop half of key	1	1/6,848; 1/3,477.5	10,218	60
	Tooth half of key	1	1/6,848; 1/3,477.5	10,631	60
	Rune javelin	5	1/6,848; 1/3,477.5	870	1,200
	Rune spear	1	1/109,568; 1/6,520.31	11,760	12,480
	Shield left half	1	1/219,136; 1/13,040.62	65,740	66,000
	Dragon spear	1	1/292,181.33; 1/17,387.5	37,303	37,440

Tertiary

	Item	Quantity	Rarity	Price	High Alch
	Brimstone key	1	1/47	Not sold	N/A
	Clue scroll (hard)	1	1/96	Not sold	12
	Clue scroll (elite)	1	1/500	Not sold	12
	Jar of smoke	1	1/2,000	113,531	0
	Pet smoke devil	1	1/3,000	Not sold	N/A

Combat Achievements

The following Combat Achievement tasks involve the Thermonuclear Smoke Devil.

Name	Description	Difficulty	Category
Thermonuclear Adept	Kill the Thermonuclear Smoke Devil 100 times.	Elite	Kill count
Hazard Prevention	Kill the Thermonuclear Smoke Devil without it hitting anyone.	Elite	Perfection
Spec'd Out	Kill the Thermonuclear Smoke Devil using only special attacks.	Elite	Restriction

Changes

Date	Changes
17 March 2021 (update | poll)	Added the Jar of Smoke to the tertiary drop table Reduced the chance of dropping Tinderboxes, Bullseye Lanterns, Pure Essence and Kebabs.
25 June 2015 (update | poll)	Added a 'peek' option to the entrance of this boss, allowing players to see the number of other players currently in the boss room.
19 March 2015 (update)	You can no longer kill Thermy without a slayer assignment if you haven't started the Western Achievement Diary.
17 July 2014 (update | poll)	Players can now receive a pet version of this boss after defeating it.
22 May 2014 (update)	When Thermy drops a clue scroll, it now appears at the correct place on the ground. Thermy and the Cave kraken boss now have 'Attack' options, rather than 'Fight'.

Trivia

• The thermonuclear smoke devil was graphically updated on 27 September 2018 as part of an update. Prior to the update, it was simply a larger version of the smoke devils scattered across the dungeon.
• The thermonuclear smoke devil and the Kraken are the only slayer bosses that can be fought with another player.
• Despite the magic defence bonus of +800, at level one the effective defence against magical attacks is equal to 13.5 magic levels due to the way magic defence rolls are calculated.