Gun Crusher is an imperial assault class introduced in Season 16, built for front-line combat with high durability and explosive ranged pressure. Fisher, a boy abducted and trained by the MU Empire's secret Imperial Corps, becomes the first Gun Crusher and is deployed to Elveland for monster annihilation missions. The class starts with balanced offensive and defensive stats and progresses through Gun Breaker to Master Gun Breaker, fitting aggressive party setups alongside Rune Wizard and Grow Lancer.