Ja, das ist etwas dämlich gemacht, genau genommen steht es außerhalb der Standard Skripte. Kopier einfach folgendes in ein neues Skript über Main und änder dadrin den Text um:
Code: 
module RPG
 class Sprite < ::Sprite
   def damage(value, critical)
     dispose_damage
     if value.is_a?(Numeric)
       damage_string = value.abs.to_s
     else
       damage_string = value.to_s
     end
     bitmap = Bitmap.new(160, 48)
     bitmap.font.name = "Arial Black"
     bitmap.font.size = 32
     bitmap.font.color.set(0, 0, 0)
     bitmap.draw_text(-1, 12-1, 160, 36, damage_string, 1)
     bitmap.draw_text(+1, 12-1, 160, 36, damage_string, 1)
     bitmap.draw_text(-1, 12+1, 160, 36, damage_string, 1)
     bitmap.draw_text(+1, 12+1, 160, 36, damage_string, 1)
     if value.is_a?(Numeric) and value < 0
       bitmap.font.color.set(176, 255, 144)
     else
       bitmap.font.color.set(255, 255, 255)
     end
     bitmap.draw_text(0, 12, 160, 36, damage_string, 1)
     if critical
       bitmap.font.size = 20
       bitmap.font.color.set(0, 0, 0)
       bitmap.draw_text(-1, -1, 160, 20, "CRITICAL", 1)
       bitmap.draw_text(+1, -1, 160, 20, "CRITICAL", 1)
       bitmap.draw_text(-1, +1, 160, 20, "CRITICAL", 1)
       bitmap.draw_text(+1, +1, 160, 20, "CRITICAL", 1)
       bitmap.font.color.set(255, 255, 255)
       bitmap.draw_text(0, 0, 160, 20, "CRITICAL", 1)
     end
     @_damage_sprite = ::Sprite.new(self.viewport)
     @_damage_sprite.bitmap = bitmap
     @_damage_sprite.ox = 80
     @_damage_sprite.oy = 20
     @_damage_sprite.x = self.x
     @_damage_sprite.y = self.y - self.oy / 2
     @_damage_sprite.z = 3000
     @_damage_duration = 40
   end
end