> 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="https://4244740567-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FbR53tfN0e2GYL3VZV2v8%2Fuploads%2FY3kZGGizXw71JS7tIBab%2F%E6%88%AA%E5%B1%8F2024-01-05%2018.00.39.png?alt=media&amp;token=e7b0e9f9-ceb0-482f-a873-594eb33f240e" 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.