I want to create a Titan Fighter, an archetype that lets the fighter wield weapons one size category larger than normal. Can someone help me understand what happens to the weight and value of, say, a greatsword for a Titan Fighter?
A Large weapon costs twice as much and weighs twice as much as the same weapon at Medium. So a Large greatsword is 100 gp and 16 lbs. The damage die increases as per this FAQ (one of the greatest FAQs ever), so a greatsword goes from 2d6 at Medium to 3d6 at Large. The critical range and multiplier do not change.