Refinery

The Refinery (錬結) menu is where you can use swords that you no longer want/need to strengthen the stats of other swords. The stats added depends on the sword used for Refining. Weaker swords will give a less addition to stats, and stronger swords give more.

The first page lets you choose the sword you want to Refine, and the second page allows you to choose up to 5 swords as Refining material.

This can be considered an alternative to scrapping the swords in the 刀解 tab in the Forge.