Thermonuclear Smoke Devil
Mid game · Ranged, Magic · solo · recommended 85+ combat
Why Ironmen kill it
The occult necklace and smoke battlestaff. One of the most killed Ironman bosses.
Requirements to access
Skills
93Slayer
Quests
None
- On a smoke devil Slayer task
Hardcore Ironman
A death here ends Hardcore status.
Drops worth chasing
| Drop | What it's for | Rate | 90% chance by |
|---|---|---|---|
| Occult necklaceGear | Occult necklace Adds 5% magic damage. The key magic upgrade. | 1/350 per kill | 805 kills |
| Smoke battlestaffUpgrade | Unlimited air and fire runes. | 1/512 per kill | 1,178 kills |
| Dragon chainbodyUpgrade | Melee body. | 1/2,000 per kill | 4,605 kills |
| Pet smoke devilPet | The boss pet. | 1/3,000 per kill | 6,907 kills |
“90% chance by” is how many kills (or chests) give a 90% chance of having the drop; most players get it sooner, and some much later. Raid rates are a share of unique drops, which depend on points and team size. See every upgrade in order on the Ironman gear progression page.
Top kill counts
Are you ready?
Look yourself up; the planner lists which bosses your stats and quests unlock.
Other mid game bosses
Requirements and drop rates (rates fetched 2026-10-01) checked against the Old School RuneScape Wiki (CC BY-NC-SA 3.0). Requirements are game facts; the descriptions here are our own.