OSRS Thermonuclear Smoke Devil Guide: Gear, Strategy & Drops

Overview: Thermonuclear Smoke Devil at a Glance

Thermonuclear Smoke Devil is a Slayer monster (often fought as a boss on task) in the Slayer boss group, rated 2 out of 5 in our boss index and normally fought solo or team.

Before you can fight Thermonuclear Smoke Devil you need 93 Slayer.

Smoke Devil task loop is what this fight actually asks of you, and it is the thing standing between you and occult necklace.

Its attack penetrates protection prayers, so praying against it does nothing.

In our index it sits in the Slayer boss group at difficulty 2 of 5, where kill times come down to Smoke Devil task loop.

Access Requirements

Thermonuclear Smoke Devil is gated behind 93 Slayer.

93 Slayer also tends to sit alongside the other Slayer boss gates, so it is usually cheaper to clear them together than to come back for each one. The boss requirements checklist lists them by group.

Location and How to Get There

Thermonuclear Smoke Devil is found in the Smoke Devil Dungeon south of Castle Wars.

Head south from Castle Wars into the Smoke Devil Dungeon. A facemask or slayer helmet is required for the dungeon itself, and you need a smoke devil task before Thermy can be attacked.

Recommended Combat Stats and Gear

Inventory and Supplies

• Food sized to its max hits: 8.
• No prayer potions for protection — its attack penetrates prayers.
• Runes for thralls, which do land here.
• An active Slayer task (93 Slayer).
• A teleport out.

Mechanics: Attack Styles, Max Hits and Immunities

Where Thermonuclear Smoke Devil Sits in Progression

Thermonuclear Smoke Devil is the entry point for the Slayer boss group, so there is nothing easier here to warm up on. Above it sit Cerberus and Skotizo.

Fight Strategy: Smoke Devil task loop

1. Position first. There is no protection prayer to set here.
2. Its lowest defence bonus is against slash.
3. Its 2-tick speed punishes greed.
4. Bank before a 8 can erase you.

• 93 Slayer unlock
• Occult necklace fantasy needs volume
• Keep a simple inventory
• Task efficiency beats fancy switches
• Pair with regular smoke devil blocks carefully

Drops and What Thermonuclear Smoke Devil Is Worth

Drops worth the trip: Occult necklace, smoke battlestaff. Whether that is worth your time depends on how many kills an hour you personally get, which is a function of Smoke Devil task loop rather than of your gear list.

Combat Achievements

Thermonuclear Smoke Devil has Combat Achievement tasks. With a 8 max hit the restrictions are mostly about execution rather than survival.

Task lists move with updates — read the current list in game.

Combat Achievements guide

Ironman Notes

Slayer masters who assign Thermonuclear Smoke Devil: Konar, Nieve, Duradel, Mortimer. Each kill is 240 Slayer XP.

Without a Grand Exchange, occult necklace, smoke battlestaff has to be earned rather than bought, and this is the fastest table it sits on.

Common Mistakes and Death Causes

• Ignoring that occult necklace fantasy needs volume
• Ignoring that keep a simple inventory
• Ignoring that task efficiency beats fancy switches
• Ignoring that pair with regular smoke devil blocks carefully
• Buying an upgrade before Smoke Devil task loop is consistent
• Gearing for Thermonuclear Smoke Devil before finishing 93 Slayer
• Travelling without the Slayer task

FAQ

What do I need to fight Thermonuclear Smoke Devil?

93 Slayer

Which protection prayer should I use at Thermonuclear Smoke Devil?

It attacks with magical ranged (100% prayer penetration), so pray against that.

How hard does Thermonuclear Smoke Devil hit?

Max hits of 8, with 240 hitpoints.

Do I need a Slayer task for Thermonuclear Smoke Devil?

Yes — 93 Slayer, assigned by konar,nieve,duradel, Mortimer.

Where is Thermonuclear Smoke Devil and how do I get there?

The Smoke Devil Dungeon south of Castle Wars. Head south from Castle Wars into the Smoke Devil Dungeon. A facemask or slayer helmet is required for the dungeon itself, and you need a smoke devil task before Thermy can be attacked.

Is Thermonuclear Smoke Devil worth doing?

Yes, for what it drops — Occult necklace, smoke battlestaff — if you want that specific reward. It is not a general money maker, and we do not publish a GP per hour figure for it because that number changes with the Grand Exchange.

What kills people at Thermonuclear Smoke Devil?

93 Slayer unlock

Related Guides

• Slayer Bosses Ranked By Difficulty And Profit
• Alchemical Hydra Guide Phases Gear Chemicals Drops
• PvM progression guide
• Best bosses for money
• Combat Achievements guide

Bottom Line

Thermonuclear Smoke Devil is not a hard fight, so the thing worth optimising is the trip around it rather than the kill itself. Smoke Devil task loop matters, but travel time and supplies decide how much occult necklace you actually accumulate.

If Thermonuclear Smoke Devil is blocking a Combat Achievement or an unlock you actually want, our PvM service is done by hand — no automation. Otherwise the bosses list has the full index.