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keep killing enemies and ships until you get it. also, try leveling up your fishing skill and when you get to lvl 15 fishing, buy the master fishing rod from the fishmaster on the docks of port royal, padres, or tortuga (they are at the VERY end of the docks). then go catch the lump fish, he usually gives out famed weapons, famed sea charts or globes (and also very stylish and bright clothing)