The super-martial artifact crossbow in "Rogue: The Legend of Salvation" is a very useful powerful weapon in the game. If you want to synthesize a crossbow, you need some materials to synthesize it. These materials are crossbow + fast flying knives. Crossbow and fast flying knives are still relatively difficult to deal with.
How to synthesize the legend of Roger's Savior
The synthetic material of the super martial arts artifact crossbow cannon is the crossbow + the fast flying knife.