Duke Fishron

"The mutant terror of the sea..."

Duke Fishron is a Hardmode boss. While he can be summoned as soon as Hardmode is initiated, he is significantly more difficult than most Hardmode bosses and will generally require post-Golem gear. Fighting Duke Fishron is completely optional and not required for game progression, however his defeat will reward the player with powerful weapons.

On the, Duke Fishron and Ocram are the final bosses due to the lack of the Moon Lord in these versions.

While Duke Fishron is alive, music Boss 1 will play.

Summoning
Duke Fishron is summoned by fishing in the Ocean, using a Truffle Worm as bait. The Truffle Worm is a rare critter that must be caught with the Bug Net or Golden Bug Net in an Underground Mushroom Biome. Once the bobber bobs, reeling the line in spawns Duke Fishron, who emerges from the water, pauses for a moment, and then begins attacking the player. On the, Duke Fishron will spawn in a random place slightly off screen.

Summoning Duke Fishron does not require that any other bosses have been defeated beforehand. However, a world must be in Hardmode in order to obtain the Truffle Worm used to summon him. He can, however, be summoned in a pre-Hardmode world by bringing a Truffle Worm from a Hardmode world.

First stage
Duke Fishron lunges at the player exactly five times, traveling through blocks, before using one of two projectile attacks:


 * Detonating Bubble: Duke Fishron blows roughly 10-20 bubbles from his mouth that follow the player at moderate speed, exploding and dealing damage on contact. The bubbles can be destroyed by any attack or projectile. These inflict the "Wet" debuff for 3-8 seconds. Duke Fishron will either move to the top left or top right of the player's location before starting the attack. The sharkron attack has the opposite direction of this attack, but it changes each time you summon Duke Fishron.
 * Sharkron: Duke Fishron waves his fins, summoning liquid blobs that fall (bypassing any platforms) until they travel 1.5x the vertical size of the screen or impact with blocks. They then spawn Sharknadoes: giant water tornadoes that each fire several Sharkrons. Sharkrons have limited flight range, are destroyed on impact with blocks, and can be killed by the player.

Second stage
When Duke Fishron falls below half health (25,000 / ), he remains stationary for a second and transforms. His skin becomes a darker green and his eyes will start glowing. His damage and speed increase significantly, but his defense is reduced to 40. His lunges become faster, and are only performed three times instead of five before executing one of his projectile attacks, which are also upgraded:


 * Detonating Bubbles are now fired while Duke Fishron flies in quick loops, which leave a trail of the bubbles behind. This attack will start in the same location relative to the player as the first stage detonating bubble.
 * There is now only one "blob" that causes a tornado, but it follows the player, creating a Cthulhunado on contact. Cthulhunadoes are significantly bigger than Sharknados, and will spawn twice as many Sharkrons.

Third stage
When Duke Fishron falls below 9,000 health, he will stop moving to transform again, and the background will be covered in a dark, blue fog. Duke Fishron will become invisible, but his eyes still glow. His damage will be reduced to 184, and he will only attack by charging at the player, but he gains the ability to teleport behind them before doing so. His charges will come in a set pattern:
 * First, he will charge once before teleporting;
 * Then, he'll charge twice, and teleport behind the player again;
 * Finally, he will charge three times, and the pattern will reset.

After being defeated, the background will return to normal and his Treasure Bag will be dropped.

Tips

 * Keep in mind your current distance from the Ocean that the boss was spawned at, so as to prevent him from becoming enraged and making the fight unnecessarily more difficult.
 * The Inferno Potion can come in very handy during this fight to prevent taking any damage from Duke's homing bubble attacks. Since they only have 1 HP, and the inferno potion has a barrier around the player, it can easily destroy the bubbles if they get too close.
 * On the other hand, The Horseman's Blade can destroy the bubbles and spawn a pumpkin for each one. With how many of them spawn it can put a large dent in Duke Fishron's health.
 * Players can build a platform along the top of the Ocean to avoid sinking. Water Walking Boots and Water Walking Potions are also good for defeating Duke Fishron and not sinking.
 * He is the only boss that is immune to the Stunned debuff, making Heart Arrows useless against him.
 * As Cthulhunadoes might be hard to see during nighttime, it is recommended to fight Duke Fishron during the day or use vision aids like the Shine Potion and Hunter Potion.
 * Using an Anti-Gravity Hook on a block and continuously going in circles can successfully allow you to dodge every attack and dashes from the boss.
 * On Expert Mode, the Shield of Cthulhu can be used to great effect, providing brief invincibility frames when dashing into him.

Trivia

 * Duke Fishron was originally part of an April Fools joke by Terraria staff that claimed an "Aquarian Horde" event was to be included in the game. The Duke Fishron element alone ended up actually being introduced.
 * In the Wii U edition, the second phase's eyes will only glow when transforming and summoning Cthulhunadoes.
 * Duke Fishron resembles a mutant creature in Season 4 Episode 2:.
 * The Sharknado attack is an allusion to the 2013 film.
 * Duke Fishron turns transparent when over blocks, much the same way that Pigrons do.
 * Duke Fishron drops an absurdly low amount of coins compared to other Hardmode bosses, despite being one of the toughest to defeat.
 * Duke Fishron appears to be a combination of a shark, a pig, and a dragon. Cenx confirmed that the Pigron was a cross between the latter two creatures, which further proves this theory.
 * The Cthulhunado could be a reference to Cthulhu's avatar the "Father of All Sharks".
 * While fishing with a Truffle Worm and a Sonar Potion, it shows as a normal catch, however fishing still summons Duke Fishron.

History
Duc Dracosson Герцог Рыбокрыл 듀크 피시론 猪龙鱼公爵