I was considering making the local rule of this Game being the group pact simply because it makes things easier for everyone (don't have to wait around for your partner and such) improvised weapons will be up to the player. I'll allow everybody to craft 3 psyches to start with, (hopefully with Evolution paths in mind) and I'll periodically come up with more. Psyches can be anything from personal weapons, to magical powers, or even summoning weapons out of magic (think Neku's shockwave blade psyche line)