Would it get too confusing if Crusader simply filled the opponent's weapon slot with another Anti-Shadow?
Also, not to ruin a good name, but isn't anti-shadow, erm, Light?
I think that might make Crusader a bit OP with it, since you'd always be able to replace their weapon.
And Anti-Shadow could be looked at as light. Anti- is a prefix meaning “against,” “opposite of,” “antiparticle of,” and while light is the opposite of darkness, and shadow is directly related to darkness, shadow is still slightly different than just darkness. A shadow can only be formed when there is something blocking the light source, not necessarily the absence of light. No light means no shadow, just darkness. So I've just swapped the positions of the shadow and the object casting the shadow. So instead of the object casting a shadow, the shadow is casting the object.
In all reality, I just combined Antimater and Liquid Shadow XD since that's basically what this weapon is.