When I saw this mod, it instantly reminded me of Ragnarok Online. Assassin Cross was my favorite class, and it was the best to me. Ah, good times, good times.
OT: I would highly suggest you add the elemental katars into the mix of the default ones, just like in ragnarok. Also, if you want to push harder you can make more types of weapons too based on maplestory and ragnarok with different effects.