User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-21371438-20140528080631/@comment-1712810-20140528180510

If I'm not mistaken... I believe Arc is wondering about design differences made in Deviljho weapons. For example, Deviljho's switch axe in MH3U undergoes a bit of a change once it reaches a certain upgrade - it becomes more menacing in appearance. In MH4, Deviljho's Great Sword and Gunlance also become more menacing in design after a certain upgrade.