Go to battleon and lick on rip in the sky. then go to library which is first door on the left. click on table behind the pool. click the scroll next to the one that is steaming. now do shoot carnax you dont have to do anything and each time you get around 450g. hint you can get a carnax blade buy clicking on the chest in front of robina and warlic. you can do shoot carnax as many times as you want