I have this idea for an ability I'd like to give one of my characters (Ruby), as follows: I'm thinking this is probably overpowered for a standard treasure, and should be major (unlike Specialty). However, before I go any further with it, I want to make sure: Do you believe its cost and effect are reasonable?
If it were just for a +1 PWC for cost, then I'd say 75 rupees is reasonable. But with the extra +1 PWC for the effects of a weapon, I would think to raise the cost more... But, I don't have as good of a hold on item costs as you.