Arcstaff is incredibly underutalized because of just how much better every other super is. Its clunky, hit reg is messed up, and doing anything with it drains chunks out of your energy.
Furthermore, its one of the only roaming supers with no sort of long range functionaility, right behind Spectral Blades (i know not every super needs long range functionality, but thats what makes others outclass them). This forces players to use other supers that can do what it does, just much better. Allowing the top and botton skilltree to utalize a javelun throw ability (similar to the warmind javelin) would hopefully fix this, and is just an idea.
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Not necessarily in need of a ranged capability, but it needs to be faster than it is. It's way too easy to outrun. Which sucks, because it's probably my second favorite Hunter super in D2