To spawn the duke fishron you need either a fibreglass fishing pole(found in the jungle) or a sitting ducks fishing pole(sold by the travelling merchant). You will also need a truffle worm. It is super fun to use magic items on this boss. Duke of fishron is the second toughest boss in the game. He has exceptionally strong ramming attacks so you should use a black belt or full ninja gear and turtle armour.
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Boss guide for Terraria
RandomA guide to defeating the bosses it terraria. it took ages. I hope you enjoy my first book ever. =)