Pride Weapons are completely garbage if you have a functional team.
Their only function if you have an okay team is letting you use Souls you normally couldn't because you lacked those kind of weapon, but if most of your teams are as bad as Slashley's and you find yourself always on the low HP %'s then you might find moderate use for them for like two turns until you get decimated, at that point a minor increase in damage over a few turns until your Kamihime dies or you successfully heal; that falls short even to SR Assault weapon that gives you half the boost no matter what throughout the whole Battle