There are a lot of choices here but I really like Sianna Khan's blade whip. We only get to see it in one scene but I thought it was really cool.
A few other ones that I think are really cool are Illia's Lighting Lash, Neo's Hush, Qrow's Harbinger, Coco's Gatlin Gun and velvet's hard light dust weapons
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Rwby 30 day challenge
FanfictionFor the month of July I will be doing the RWBY 30 day challenge