User blog:ACWeapons/RWBY x SAO Crossover Fanfiction - Battle System

I'm in the middle of typing a short story for someone. It's a crossover between RWBY and Sword Art Online. It will be a tag team fight with Ruby and Weiss against Kirito and Asuna. So far I only have two major problems. The battle system to apply RWBY mechanics and a weapon for Asuna. What would be the best way to go about this? Both her and Kirito will make their own weapon.