Voidlock is just not a melee class and it would never make sense to invest in it outside PvP. Make it serve the bigger picture and identity of the class which is grenade spam.
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I always thought it should do the Destabilizing Round thing, and just make everything in a large(real large) radius Volatile Another melee option I always thought might be cool would be to have a slower purple ball that can do a big pull toward it if you push the melee button again