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.

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
Slayer info
Slayer level										93
Slayer XP										240 xp
Category										Boss, Smoke devil
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
Immune to poison															Immune to venom
Advanced data
Monster ID										499

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The thermonuclear smoke devil, often referred to as Thermy, is the boss version of the smoke devil, found in the Smoke Devil Dungeon. These require a minimum of 93 Slayer to kill. 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 and the pet smoke devil. Their non-boss variants also has a chance to drop the occult necklace, but at a lower drop chance.

A dwarf multicannon cannot be used inside the boss room. If attempted, the cannon will be destroyed (similar to areas like at KBD or KQ).

Drops

Drop rates estimated based on 79,084 kills from the Drop Rate Project, unless otherwise cited.

The average Thermonuclear smoke devil kill is worth 20,727.45.

The average Thermonuclear smoke devil kill while on a Konar task is worth 22,778.97.

100%

	Item	Quantity	Rarity	Price	High Alch
	Ashes	1	Always	49	1

Weapons and armour

	Item	Quantity	Rarity	Price	High Alch
	Rune dagger	1	5/128	4,410	4,800
	Rune chainbody	1	4/128	29,515	30,000
	Red d'hide body	1	3/128	5,894	6,738
	Rune battleaxe	1	3/128	24,521	24,960
	Mystic air staff	1	3/128	25,096	25,500
	Mystic fire staff	1	3/128	25,069	25,500
	Rune scimitar	1	2/128	14,945	15,360
	Rune knife(p++)	50	1/128	16,050	4,950
	Dragon scimitar	1	1/128	59,477	60,000
	Ancient staff	1	1/128	64,681	60,000
	Occult necklace	1	1/350	419,336	27,000
	Smoke battlestaff	1	1/512	1,749,213	9,300
	Dragon chainbody	1	1/2,000	290,197	150,000

Runes and ammunition

	Item	Quantity	Rarity	Price	High Alch
	Smoke rune	100	10/128	7,800	1,200
	Air rune	300	8/128	1,500	600
	Soul rune	60	8/128	8,280	10,800
	Rune arrow	100	2/128	5,200	24,000

Consumables

	Item	Quantity	Rarity	Price	High Alch
	Ugthanki kebab	3	4/128	1,857	36
	Tuna potato	3	3/128	3,816	201
	Sanfew serum(4)	2	3/128	61,694	360
	Prayer potion(4)	2	1/128	17,536	228

Resources

	Item	Quantity	Rarity	Price	High Alch
	Pure essence	300 (noted)	5/128	600	600
	Molten glass	100 (noted)	2/128	11,900	100
	Mithril bar	20 (noted)	2/128	12,000	3,600
	Coal	150 (noted)	2/128	21,000	4,050
	Magic logs	20 (noted)	2/128	19,560	3,840
	Gold ore	200 (noted)	2/128	30,600	18,000
	Diamond	10 (noted)	1/128	18,470	12,000

Other

	Item	Quantity	Rarity	Price	High Alch
	Coins	10,000–20,000	15/128	10,000–20,000	10,000–20,000
	Tinderbox	1	10/128	89	0
	Fire talisman	1	4/128	4,730	2
	Bullseye lantern	1	3/128	1,037	252
	Desert goat horn	50 (noted)	2/128	2,600	350
	Grimy toadflax	15 (noted)	2/128	39,390	165
	Onyx bolt tips	12	2/128	99,420	7,200
	Snapdragon seed	2	2/128	100,528	72
	Grapes	100 (noted)	1/128	5,800	0
	Magic seed	1	1/128	114,565	253
	Dragonstone ring	1	1/128	11,504	10,575
	Crystal key	1	1/128	20,731	90

Gem drop table

There is a 3/128 chance of rolling the gem drop table.

	Item	Quantity	Rarity	Price	High Alch
	Nothing	N/A	1/85.49; Never	N/A	N/A
	Uncut sapphire	1	1/170.67; 1/86.67	398	15
	Uncut emerald	1	1/341.33; 1/173.33	667	30
	Uncut ruby	1	1/682.67; 1/346.67	1,302	60
	Nature talisman	1	1/1,820.44; 1/924.44	927	2
	Uncut diamond	1	1/2,730.67; 1/1,386.67	2,536	120
	Loop half of key	1	1/5,461.33; 1/2,773.33	10,105	60
	Tooth half of key	1	1/5,461.33; 1/2,773.33	10,189	60
	Rune javelin	5	1/5,461.33; 1/2,773.33	870	1,200
	Rune spear	1	1/87,381.33; 1/5,200	11,913	12,480
	Shield left half	1	1/174,762.67; 1/10,400	65,254	66,000
	Dragon spear	1	1/233,016.89; 1/13,866.67	36,966	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
	Pet smoke devil	1	1/3,000	Not sold	N/A

Changes

Date	Changes
25 June 2015 (update | poll)	Added a 'peek' option to the entrance of this boss.
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.