"A weapon you could have bought anyway" than can change abilities each encounter. What's that? A guy who's weak to a certain weapon configuration? WHY SURE, I HAVE THAT!"You have a weapon you could have bought anyway" doesn't amount to much. True, it's hard to disarm you, but that just makes it equivalent to a soulknife. The most useful parts of the ability are that it applies to both weapons when dual-wielding, and makes Dex-based melee fighters better if they need to switch to a ranged weapon.
Guess I could do that...There is more than enough room here to slap on some abilities related to hiding your identity at higher levels. Since your weapon's power is supposed to be relative to your character level, granting a weapon that scales with your class level means that your class features become weaker whenever you take a level that's not in this class, including after you've completed the PrC.
Updates, they are occuring.