The Thermonuclear Smoke Devil is a mid-level Slayer boss requiring 93 Slayer to kill, found in the Smoke Dungeon. While not the most challenging boss in Old School RuneScape, it's a solid money-maker with a steady drop table and some highly sought-after unique items.

This guide will cover how to get there, what gear to bring, killing strategies, and what kind of GP and XP you can expect per hour.

Why Kill the Thermonuclear Smoke Devil?

Unique drop: The Smoke Battlestaff – only obtainable from this boss.

Great alchables: Dragon scimitar, Ancient staff, and more.

Valuable unique:

  Smoke Battlestaff – 1/512

  Occult Necklace – 1/350

  Dragon Chainbody – 1/2,000

Resource drops: Pure essence, molten glass, mithril bars, coal, magic logs, gold ore, and even diamonds.

On average, you can expect around 1.2–1.4M GP per hour assuming ~80 kills/hour.

Requirements

93 Slayer (to kill Smoke Devils).

Assigned task: You must be on a Smoke Devil Slayer task.

Protective gear: A face mask or Slayer helmet to enter the dungeon.

Getting There

There are two main travel methods:

1. Ring of Dueling → Castle Wars → Run east → south → west to the dungeon.

2. Fairy Ring (BKP) → Run northeast to the dungeon. (Recommended)

If you've completed the Lumbridge Elite Diary, you won't need a Dramen/Lunar staff for fairy rings.

Pro Tip: Before entering, right-click the cave and disable the smoke effect to avoid annoying on-screen haze.

Recommended Gear Setup

The boss is weak to slash attacks, so gear accordingly.

Example Setup:

Slayer Helmet

Amulet of Fury

Fire Cape

Rada's Blessing

Osmumten's Fang / strong slash weapon

Dragon Defender

Karil's Leather Top + Bandos Tassets (or full Karil's if available)

Barrows Gloves

Primordial Boots

Ring of Suffering

Spec Weapon: Bring any you prefer (e.g., Dragon Claws or Dragon Dagger).

Inventory Setup

Super combat potions

Prayer potions (optional if using the Redemption method)

Teleport out (House or Escape Tele)

Food (fill the rest of your inventory)

Optional: Thralls, Alch runes to manage drops

Killing Strategies

1. Melee Method (Recommended)

  Drink super combat potion

  Activate Piety

  Spec the boss on entry

  Use food to sustain – bring plenty as his damage can spike

  Keep an eye on HP (don't AFK too hard – he can combo you down fast)

2. Redemption Method

  Keep the Redemption Prayer active

  At 10% HP, Redemption restores you but drains your Prayer

  Bring multiple Prayer potions or Super Restores

  Extends trips significantly, but costly for Ironmen

This method is riskier since you're always low on HP.

Example Hour Results

In one hour of farming:

64 kills achieved (wiki suggests up to 80 kills/hour).

97k XP total:

  Attack – 61k

  Hitpoints – 20k

  Slayer – 15.5k

Loot worth 3.25M GP (lucky staff drop included).

Even without the Smoke Battlestaff, profits would still be around 1.25M GP/hour.

Final Thoughts

The Thermonuclear Smoke Devil is one of OSRS's most chill Slayer bosses. While the Slayer XP is underwhelming, the OSRS GP per hour and pet chance make it worthwhile.

Great for Ironmen (Alchs + resources).

Solid for main accounts looking for consistent profit.

Easy to kill, but requires attention – don't risk an AFK death.

Whether you're hunting the Occult Necklace, grinding for the pet, or just stacking GP, this boss is a great mid-game money-maker with straightforward mechanics.