Not to be confused with Warbanner.
The War Banner is a returning common item in Risk of Rain 2, although this time with a space in its name. Upon leveling up, a banner is placed on the ground beneath the players feet. Being within its area of influence (default 16 meters) boosts attack and movement speeds by 30%.
Picking up multiple War Banners only increases the area by 8 meters, the buff remains the same. Having more than one banner near one another doesn't stack the buff.
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Unfortunately, these banners won't increase attack speed by more than 30%