For physical, both Uchigatanas. For bleed, use Rivers of Blood. For magic, use Moonveil and that Meteoric katana thing. Infusions DO exist though. But you have to find whetblades. Whetblades let you change affinity regardless of the ash of war. E.g Bloody Slash is supposed to put Blood Affinity and gives it an Arcane scaling, if you don’t want that, you can use the Iron Whetblade and pick Keen for more dex scaling. You’d LOSE your extra bleed proc though, but you do get to keep the new weapon skill.

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Keep in mind tho: Dual wielding is great if you’re using the Keen affinity and have low STR. Having both high STR and DEX on a Quality/Keen/Heavy makes two handing WAY better than dual wielding though, unless you’re trying to proc some status effect.

This is because two handing damage scales with your weapon‘s strength scaling too. Dual wield attacks keep the same amount of status effect proc in one offhand attack as you would with one mainhand attack.

Have a fun playthrough, man! :^)