The latest Jujutsu Zero update adds a pretty important progression system: Refinements. If you have an accessory that you really like, you can now push its stats even further instead of constantly replacing it with another piece of gear.
The catch? The higher you go, the more expensive and risky the upgrades become. The final refinement has only a 5% success chance, so you’ll want to understand the system before throwing your rare materials into it.
Here’s everything you need to know about Refinements, including the materials, Curse Calamity raid, costs, success rates, and the best way to approach the upgrades.
Jujutsu Zero Refinements Guide – How to Upgrade Accessories
Refinement allows you to upgrade the stats of your accessories.
Every accessory starts at Refinement Level 1, and you can currently take it all the way to Level 6.
Each successful refinement increases all of the accessory’s stats by 10%.
That means:
| Refinement Level | Total Stat Increase |
|---|---|
| Level 1 | +0% |
| Level 2 | +10% |
| Level 3 | +20% |
| Level 4 | +30% |
| Level 5 | +40% |
| Level 6 | +50% |
So, reaching Level 6 gives the accessory a 50% increase to all of its stats.
That’s especially valuable on accessories with strong offensive or build-specific bonuses.
Refinement Materials
You’ll need three special materials to progress through the refinement levels:
- Tetsu – Grade 2 material
- Heaggen – Grade 1 material
- Tamah – Special Grade material
These materials currently come from the Curse Calamity raid.
Because the rarest materials are needed for the final refinements, you’ll want to start farming the raid before attempting to push an accessory all the way to Level 6.
How to Get Refinement Materials
The main source of refinement materials is the Curse Calamity raid.
The raid has three difficulties:
| Difficulty | Required Level |
|---|---|
| Easy | 1,000 |
| Normal | 1,500 |
| Hard | 5,000 |
The exact drop rates for Tetsu, Heaggen and Tamah aren’t currently known.
Because of that, the best approach isn’t necessarily to force yourself into Hard immediately. If you can clear Normal significantly faster and more consistently, repeatedly farming it can be more practical.
More importantly, you don’t want to spend most of your time failing a harder raid when you could be completing an easier one several times instead.
How Does the Curse Calamity Raid Work?
Curse Calamity isn’t quite the same as a regular overworld raid.
When you enter, you’ll first have to deal with a group of enemies. After clearing them, a boss appears.
Defeat that boss and you’ll be able to move on to the next area, where you’ll face another group of enemies and eventually the final boss.
Once the final boss is defeated, you’ll receive the raid rewards.
Because the raid mixes groups of enemies with boss fights, a technique with good AoE damage and strong single-target damage is particularly useful.
You want something that can clear groups quickly without leaving you struggling against the bosses.
All Refinement Costs and Success Rates
This is where things get serious.
The first couple of refinements are relatively forgiving, but the success rates drop dramatically as you approach Level 6.
Level 1 → Level 2
The first refinement requires:
- 1 Tetsu
- 5 Cursed Crystals
- 1,000 Lumens
- 50,000 Yen
Success Chance: 90%
Failure Chance: 10%
This is easily the most comfortable refinement. With a 90% success rate, most players should be able to get through it without burning too many materials.
Level 2 → Level 3
You’ll need:
- 2 Tetsu
- 10 Cursed Crystals
- 1,500 Lumens
- 100,000 Yen
Success Chance: 70%
Failure Chance: 30%
A failed attempt doesn’t lower your accessory’s refinement level. It simply consumes the materials for that attempt, meaning you’ll have to collect another set and try again.
Level 3 → Level 4
This is where the system starts becoming much more expensive.
Requirements:
- 2 Tetsu
- 1 Heaggen
- 15 Cursed Crystals
- 2,000 Lumens
- 250,000 Yen
Success Chance: 35%
Failure Chance: 65%
At this point, you should expect to make multiple attempts.
Don’t be surprised if you burn through several sets of materials before getting the successful upgrade.
Level 4 → Level 5
The fourth refinement requires:
- 2 Heaggen
- 20 Cursed Crystals
- 3,000 Lumens
- 350,000 Yen
Success Chance: 15%
Failure Chance: 85%
This is a massive jump in difficulty.
Since every failed attempt consumes your materials without reducing the accessory’s current level, you’ll need a healthy stockpile of Heaggen before attempting this upgrade.
Level 5 → Level 6
Finally, we reach the expensive one.
The final refinement requires:
- 1 Tamah
- 25 Cursed Crystals
- 4,000 Lumens
- 500,000 Yen
Success Chance: 5%
Failure Chance: 95%
Yes, only 5%.
In other words, the final upgrade can potentially take a huge number of attempts.
A 5% success rate works out to roughly one success per 20 attempts on average, but that’s only a statistical average. You could get it immediately, or you could fail more than 20 times.
Minimum Cost to Reach Level 6
If you somehow succeed on every single attempt, taking one accessory from Level 1 to Level 6 requires:
- 5 Tetsu
- 3 Heaggen
- 1 Tamah
- 75 Cursed Crystals
- 11,500 Lumens
- 1,250,000 Yen
That’s the absolute minimum.
In a real situation, you’ll probably spend significantly more because the final three refinements have much lower success rates.
How Expensive Can Level 6 Become?
The Level 5 → Level 6 refinement is where your resources can disappear very quickly.
With a 5% success rate, around 20 attempts is the statistical average.
At 20 attempts, you’d be looking at approximately:
- 20 Tamah
- 500 Cursed Crystals
- 80,000 Lumens
- 10,000,000 Yen
Again, this isn’t a guaranteed cost. You might get lucky on attempt one, or you could require considerably more than 20 attempts.
That’s why it’s a bad idea to start refining your accessories without first building up a decent stockpile of materials.
Failed Refinements Don’t Destroy Your Accessory
There’s at least one nice thing about the system.
If a refinement fails, your accessory stays at its current refinement level.
For example, if you’re attempting to go from Level 5 to Level 6 and fail, your accessory doesn’t drop back to Level 4.
The downside is that you lose the materials spent on the failed attempt.
So if you’re sitting at Level 5, you remain at Level 5 and simply need another set of materials for the next attempt.
Should You Refine Every Accessory?
Definitely not.
This is one of the most important things to understand about the system.
Refinement materials, particularly Heaggen and Tamah, are valuable. You don’t want to waste them upgrading an accessory that you’re probably going to replace soon.
Before starting, look at your current build and ask yourself which accessory you’re actually planning to keep using.
If it’s one of the strongest pieces in your build and you don’t expect to replace it anytime soon, that’s a much better refinement target.
Is Level 2 or Level 3 Worth It?
Yes.
You don’t necessarily need to aim for Level 6 immediately.
The first two upgrades have much better success rates and can already give you a noticeable stat increase.
Getting your main accessory to Level 2 gives +10% to its stats, while reaching Level 3 gives +20%.
Considering how much more brutal the success rates become at Levels 4–6, stopping at Level 2 or 3 while you continue farming can be a perfectly reasonable strategy.
Best Refinement Strategy
If you’re trying to make the most of your materials, I’d recommend approaching the system in stages.
First, choose your main accessory. Don’t randomly refine several different pieces of gear.
Next, farm Curse Calamity. Run the highest difficulty you can clear consistently and efficiently.
Then, get the early refinements done. Levels 2 and 3 have relatively high success rates and provide useful stat boosts.
After that, start saving your Heaggen and Tamah rather than spending them everywhere.
Once you’ve built up a large enough stockpile, you can start attempting Levels 4–6.
And most importantly, don’t get discouraged by failures. The low success rates are intentional, and failing doesn’t damage the accessory itself.