You get... BLUE SLASHER!!

borockman/Vixy/Blackhook gets this weapon from defeating B (Powered). As demonstrated by borockman, s/he gets to fire off a melee-range energy wave that has tremendous power, but that's all the range it can have. It has an added benefit of cancelling out small to medium-sized projectiles. Blackhook will slash with his hook instead.
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Sprites used from Sprites' Inc.
Concept from my evil mind... With help from Blue Valkyrie from RPM.