I was thinking there should be hunter boots that allow hunters to run on walls. They are perfect for it they are a stealthy character. The perk could either be on a set of boots that come in TTK or the next Expansion or they could possibly go on the (Bones of Eao) boots right next to the extra double jump perk. That may be over powered though. I think it be sweet though the stealthy character running across a wall to flank behind there enemy. Go invis then run on a wall to flank behind your opponents.
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Not that it wouldn't be neat. I just don't think it would be practical. There is an invisible ceiling and if your in pvp you will be killed unless you get lucky that he missed a shotgun hit and has slow rof.