I first wanted to give the weapons Transformation, but that doesn't really work since most weapons are almost completely useless in their weapon form without a meister. Another idea I had is to give the meister's attacks the Weapon (-5) and Assisted (-15) flaws, but this negates any special properties of the weapon.
For the soul resonance, my idea is to give both weapon and meister a unique ability called Soul Resonance, and give the powerful attacks a Requirement for a minimum level in this ability (similar to Yuu's Trust ability). This ability would be linked to a specific partner, unless you take it with Weapon Arsenal (some characters on the show like Stein and Lord Death would have this). Maybe this could be combined with Transformation somehow, but I'm not sure how a transformation involving two characters would work.
Any thoughts on how to best approach this? If I have a good solution, I promise I'll post the finished builds here.
