Farron great sword would probably be better for your build or old wolf curved sword. Both of them actually have Dex scaling that's useful. Also, for PvP, I recommend dropping the estus ring since you aren't going to be drinking it much anyway. Replace it with something like prisoner chain.
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Oh and the estus ring has been replaced with the carthus milkring
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Old Wolf Curved Sword is only good on pure Dex builds. For strength/quality builds, Exile Greatsword is better in every way. At 40/40, OWCS does 482, and EGS does 568. That being said, OWCS gets style points for being the coolest looking sword.
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The dex scaling is the reason my zweihander is refined. B scaling strength B scaling dex
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Forgot what refined did. Yeah, you're mostly fine.