> For the complete documentation index, see [llms.txt](https://bladerite.gitbook.io/bladerite-whitepaper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bladerite.gitbook.io/bladerite-whitepaper/assets/patterns/upgrade-rules.md).

# Upgrade Rules

<figure><img src="/files/rLcMYaOLnG86lhbjmpNt" alt=""><figcaption><p><mark style="color:yellow;"><strong>Pattern Upgrade</strong></mark></p></figcaption></figure>

* 3 identical low-level patterns with fuse cost (Dragon Glass) can be fused to one high-level pattern.
* After upgrading, the pattern's basic attributes are randomly reassigned, while unique passive and class-specific attributes are retained.
* If the materials for the upgrade include patterns with rare attributes, players must manually choose one to preserve for the next level.
* **Durability**: Higher-level patterns have higher durability, and no scientific techniques have been found to repair the durability.


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