Smoke devils are located within the Stronghold slayer cave. Having a facemask, slayer helmet, or slayer helmet (i) along with 93 slayer is required to slay this creature. Smoke devils can only be attacked if they are assigned as a slayer assignment. 

Drops:

Guaranteed Drops:

Item:	Image:	Rarity:	Amount:
Ashes		guaranteed	1

Weapons and Armor:

Item:	Image:	Rarity:	Amount:
Adamant Battleaxe		Common	1
Mithril plateskirt		Common	1
Air battlestaff		Uncommon	1
Black d'hide Vambraces		Uncommon	1
Fire battlestaff		Uncommon	1
Red d'hide body		Uncommon	1
Rune arrow		Uncommon	24
Runite bolts		Uncommon	15
Rune dagger		Uncommon	1
Rune chainbody		Uncommon	1
Rune full helm		Uncommon	1
Rune 2h Sword		Rare	1
Occult necklace		Rare Drop rate: 1/512	1
Dragon chainbody		Very rare Drop rate: 1/32,768	1

Runes and Talismans:

Item:	Image:	Rarity:	Amount:
Fire rune		Common	37, 150
Smoke rune		Common	10-40
Air rune		Uncommon	37
Soul rune		Uncommon	10

Herbs and seeds:

Item:	Image:	Rarity:	Amount:
Grimy guam		Common	1
Grimy harralander		Common	1
Grimy marrentill		Common	1
Grimy torromin		Common	1
Grimy avantoe		Uncommon	1
Grimy cadantine		Uncommon	1
Grimy dwarf weed		Uncommon	1
Grimy irit		Uncommon	1
Grimy kwuarm		Uncommon	1
Grimy lantadyme		Rare	1
Grimy Ranarr		Rare	1

Miscellaneous: 

Item:	Image:	Rarity:	Amount:
Adamant bar		Common	1
Coins		Common	80-800
Coal (noted)		Common	15
Crossbow string		Common	1
Magic logs (noted)		Common	5
Shark		Common	1
Steel bar		Common	2
Ugthanki kebab		Common	1-3
Clue scroll (hard)		Rare	1
Clue scroll (elite)		Rare	1
Runite bar		Rare	1