Soul Match
This is probably the most confusing function at Nioh’s Blacksmith, but it’s one that will help to keep your favorite pieces of equipment up to snuff all throughout the game. With Soul Match, you’ll be able to use a higher level weapon to upgrade a lower level weapon. Through this process of infusion, the higher level weapon will be destroyed, but the damage multiplier of the lower level weapon will be increased. The lower level weapon will also have its level raised to match the weapon that was destroyed. I’m using weapons as an example here, but Soul Match can be used for armor too.
However, it’s worth noting that the Familiarity meter for the infused weapon will be reset. This is a small price to pay, though, considering that you’ll be able to raise the base stats of your favorite gear, and the Familiarity meter can always be maxed out quickly in battle or through the use of Whetstones.
The best way to utilize Soul Match is to upgrade your low-level purple gear (with the right special effects and bonuses, of course) with a high-level piece of white gear. That way, you’ll get a much stronger and much more valuable purple piece of equipment that will last you longer in Nioh.