Synthesis Odds & Fusion Calculator
| Fuse 9 × | Upgrade chance | Result distribution |
|---|---|---|
| Common | 100.0% (guaranteed) | Uncommon 95.2%Rare 4.76% |
| Uncommon | 100.0% (guaranteed) | Rare 96.2%Legendary 3.85% |
| Rare | 100.0% (guaranteed) | Legendary 97.6%Immortal 2.44% |
| Legendary | 100.0% (guaranteed) | Immortal 99.0%Arcana 0.990% |
| Immortal | 50.1% | Immortal 49.9% (no change)Arcana 49.9%Beyond 0.249% |
| Arcana | 33.4% | Arcana 66.6% (no change)Beyond 33.3%Celestial 0.166% |
| Beyond | 23.1% | Beyond 76.9% (no change)Celestial 23.1%Divine 0.077% |
| Celestial | 16.7% | Celestial 83.3% (no change)Divine 16.7%Cosmic 0.017% |
| Divine | 9.09% | Divine 90.9% (no change)Cosmic 9.09% |
| Cosmic | max grade | Cosmic is the highest grade — it can't be fused further. |
On average, fusing 9 at a time. Each fuse below Immortal is a guaranteed grade-up; from Immortal on, some fuses stay the same grade and have to be repeated.
Synthesis fuses 9 items of the same grade into a single item. The result's grade is decided by weighted odds: a big chance to advance one grade, a small chance to leap two, and — only from Immortal upward — a chance to land back on the same grade.
That same-grade chance is why early synthesis feels free but high-grade synthesis is brutal. Reaching Immortal from Common is four guaranteed steps — 6,561 Commons. The single jump from Immortal to Arcana succeeds under half the time, so it takes roughly 17 Immortals on its own.
The odds above are exact in-game values and are identical for gear, accessories and materials — only the result's item level depends on the recipe and the materials you feed in.