Quote Originally Posted by Aidoru View Post
Oh you meant 2 different weapons of the same type. There's no problem in that. I recall someone mentioning that equipping a weapon in preference to your soul unit will net additional bonus stats but I'm not sure where that's displayed or if true.
What I read on the JP wiki is that if you equip a sub-weapon with the same type as a kamihime (e.g., Sol uses a staff), that kamihime will receive a 20% boost in attack power from it.