Broken Blade Explosion Island Guide
Explosion Island farm route: Event Helmets, Headless Knight summons, Eye Patch drops, and crafting the 5-Star Explosion Buster weapon.
By Bloxron Editorial Team · Last updated
Explosion Island is permanent endgame content in Broken Blade, centered on the Headless Knight boss and the Explosion Buster weapon. Collect Event Helmets, summon the Headless Knight, farm Eye Patches, and craft Explosion — one of two 5-Star capstone weapons alongside Yamato.
Explosion Island Overview
Event Loop
Farm Event Helmets ↓ Travel to Explosion Island ↓ Summon Headless Knight ↓ Defeat the Boss ↓ Collect Eye Patches ↓ Craft Explosion
The route revolves around repeatedly defeating the Headless Knight and gathering Eye Patches for the Explosion craft.
How to Start on Explosion Island
Step 1: Obtain Event Helmets
Event Helmets are required to summon the Headless Knight. Farm them from Black Cat mystery rewards across islands and from bosses — Niflheim onward is the best farm band.
Black Cats can spawn on:
- Origin Island
- Niflheim
- Nidavellir
- Explosion Island
- Jotunheim
Exact helmet drop rates are not published — treat any percentage you see as an estimate.
Step 2: Travel to Explosion Island
Once you have an Event Helmet, travel to Explosion Island. The island contains:
- Headless Knight Altar
- Explosion Weapon Altar
Step 3: Summon Headless Knight
At the altar:
- 1 Event Helmet = 1 summon
Players can also use Auto Spawn to queue multiple summons.
Headless Knight Boss
Boss Information
| Attribute | Value |
|---|---|
| Name | Headless Knight |
| Location | Explosion Island |
| Difficulty | Nightmare |
| Health | 800,000,000,000 |
| Summon Cost | 1 Event Helmet |
Headless Knight is currently one of the strongest bosses in Broken Blade.
Headless Knight Drops
Exclusive Event Drops
| Item | Drop Chance |
|---|---|
| Explosion! | 7.04% |
| Eye Patch | 25% |
| Megumin | 0.44% |
Eye Patch
Eye Patch is the most important material in the event.
Source
- Headless Knight Boss
Drop Chance
| Item | Chance |
|---|---|
| Eye Patch | 25% |
Crafting Explosion takes 65 Eye Patches.
Explosion Weapon
Explosion is the main reward of the event and is currently considered the game's first 5-Star weapon. See the weapons guide for how Buster weapons fit into your build.
Crafting Requirements
| Material | Amount |
|---|---|
| Money | 1,500,000,000 |
| Gems | 20,000,000 |
| Buster Piece I | 3,000 |
| Buster Piece II | 1,500 |
| Buster Piece III | 800 |
| Eye Patch | 65 |
| Fire Seed | 10,000 |
Buster pieces and Fire Seeds are covered in the materials guide.
Best Farming Method
Early Phase
Farm Black Cats until you build up a large supply of Event Helmets.
Mid Phase
Use Auto Spawn on Explosion Island to continuously summon Headless Knight.
Late Phase
Prioritize collecting:
- Eye Patch ×65
- Explosion! drops
- Remaining Buster Pieces
- Fire Seeds
FAQ
How do I get Event Helmets?
Event Helmets drop from Black Cat mystery rewards across islands and from bosses (Niflheim onward is the best farm band). Use one helmet at the Explosion Island altar to summon Headless Knight.
Where do Eye Patches come from?
Eye Patches drop from the Headless Knight boss on Explosion Island — about 25% per clear.
How many Eye Patches are needed for Explosion?
Explosion requires 65 Eye Patches, plus Buster pieces, Fire Seeds, money, and gems.
How much HP does Headless Knight have?
Headless Knight has 800 billion HP.
What is the main goal on Explosion Island?
Farm Headless Knight for Eye Patches and craft the 5-Star Explosion Buster weapon. Guts (Black Swordsman) also spawns here for Sacrifice Pieces used in Dragon Slayer.