Yes, that's the best DPS attack chain. Achilles' Heel doesn't stack with itself, so I'd just put the one in Gambler's Cut. However, the PvP resist proc does stack with Achilles' Heel, so go ahead and put it in Golden Dragonfly. I don't think there are any differences between the two, but I'm not online to check. You can easily look them up in the Auction House.
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What's the best attack chain to use with the Katana set for ST DPS?
Is it this?
Golden Dragonfly > Gambler's Cut >Soaring Dragon >Gambler's Cut
Oh, and the Achilles' Heel: - Res Proc, can it stack? I will just keep the one in Gambler's Cut.
What's the difference between the Achille's Heel -Res proc and the new pvp -res proc? I heard the new pvp -res proc has a better chance to land.