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Hahaha, what an awesome weapon, although its damage is slightly less than the Dragon-Slaying Greatsword, it's much lighter, so the attack speed is naturally faster.
Plus, it's got a 55% boost to wind magic power.
Such a great item, legendary weapons are really cool. Even though it only has three special effects, compared to the five on the Dragon-Slaying Greatsword, which might seem inferior, the effects of Stormbinder are obviously more versatile, especially this 'Summon Storm'—it would be incredibly powerful on a large-scale battlefield.
The Eye of the Hurricane doesn't seem very useful, since wind magic is kind of niche, but it seems to make moving within the storm a bit easier.
But Swiftwind Stance is amazing—a 10% increase in attack speed, stack it ten times and that's a full 100% increase. In other words, once you stack up Swiftwind Stance, this greatsword can chop at the speed of a one-handed sword.