Duke Fishron

Duke Fishron is a Hardmode Boss. He is immune to the On Fire!, Poisoned, Venom, and Frostburn debuffs. He will always drop exactly one of his five weapons at a 20% drop chance for each; the Fishron Wings, Mask and Trophy are dropped independently, however.

Summoning
Duke Fishron is summoned by pooping on an a angler fish or a goldfish. if it turns day he will hide in your butt.

First stage
Duke Fishron lunges at the player exactly five times, traveling through all 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. These bubbles can be destroyed via any attack or projectile, however they can be hard to hit.


 * 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. The Sharkrons have limited flight range, are destroyed on impact with blocks, and can be killed by the player.

After a projectile attack, he lunges another 5 times, beginning the cycle again.

Second stage
When Duke Fishron falls below 25,000 health, he remains stationary for a second and his eyes glow. 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.
 * There is now only one "blob" that causes the tornado, but it follows the player, creating a "Cthulhunado" (upgraded version of first stage's "Sharknado") on contact. The blob itself does not cause damage, but will spawn twice as many Sharkrons as in the first stage.

Tips

 * If you get far enough away from Duke Fishron, he will despawn, like most bosses. As most strategies involve outrunning him, it is best to remember not to get too far ahead.
 * A Sharknado tends to spawn at the site of Duke Fishron's death.

Trivia

 * Duke Fishron was 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.
 * His Sharknado attack is a nod to the 2013 movie Sharknado.
 * Duke Fishron turns transparent when over blocks, much the same way that Pigrons do.

History
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