Guide:Duke Fishron strategies

"The mutant terror of the sea..."

Duke Fishron is a tough Hardmode Boss and one of the final Bosses in versions of Terraria. With very high movement speed, high damage and deadly sharknadoes, it's one of the most difficult bosses in the game.

Spawn Condition
Duke Fishron can be spawned by using your with  as Bait.

It must then be defeated within the Ocean.

The Fight
Duke Fishron has two phases, with one additional phase in.

First Phase
Duke Fishron will attack in three different ways during the first phase. The first thing Fishron will do is begin his charging flurry. He will charge towards the player exactly five times, with a short pause between each charge.

After each charge, he will execute one of the two Projectile attacks:
 * The First attack fires around 20 ;
 * The Second attack will create two small Bubbles on either side of where he is located, that will each generate a Sharknado. The Sharknadoes are tall and do damage, but they also fire towards the player.

Second Phase
When Duke falls below 25,000 health, he will stay stationary for a second, then his eyes will glow as he enters his second stage. His damage, and speed increase significantly, however his defense drops to 40.

His charge flurry only has 3 charges, but they are a bit faster than before. He still has two kinds of projectile attacks, but their patterns change:
 * The Detonating Bubble attack now causes him to move around in a circle, dropping the bubbles in a circle around his original location. This spreads out the bubbles, making it more difficult to hit them all.
 * His Sharknado attack upgrades to summon a Cthulhunado. He will fire a special bubble at you that is quite fast. When it hits you, it will spawn a Cthulhunado, a very tall tornado that does lots of damage and fires large quantities of Sharkrons. It also lasts much longer.

Note that, after the battle is over, care should still be taken. If he has launched a Cthulhunado, it may still fire Sharkrons. He may also have died within the Cthulhunado, so don't charge into it to collect his drops until it dissipates.

Duke Fishron's charging attack is his primary attack, and one of the most difficult to dodge.

The key to dodging it is to try to move perpendicularly to where he is aimed, right before he makes his charge. For example, if you are horizontal with him when he is about to charge, you need to quickly up (or down, if you're already flying). If he is right above/below you, then you need to quickly move left or right.

One important element of the Sharknado attack is that they will spawn in the location where Duke Fishron was when he fired the attack. And they will despawn almost exactly when he is ready to drop another pair of Sharknadoes.

As long as the player keeps in mind what attack Duke Fishron will do next, the player can put him in a position that makes it hard for the player to hit the Sharknadoes themselves. For example, during the charging flurry before the Sharknado attack, the player can move towards the edge of the screen, horizontally. That way, the player can run the other way knowing that they will not encounter Sharkrons from that direction. This also means that attacks towards Duke Fishron will also be towards the direction of incoming Sharkrons.

Also, note that Duke Fishron's first attack will always be bubbles.

Sharknadoes are quite tall; getting over them will require fast or.

The upgraded Sharknado attack is a bit more difficult to deal with. It's taller, and it does more damage than the original, plus it fires more Sharkrons.

However, there is one thing that makes it a bit easier to deal with: the Cthulhunado will spawn in the location where you were when the bubble hit you. This gives you a bit more control over where the tornado spawns, so you have more of a chance (if you are fast) to make sure it doesn't spawn in an inconvenient place. You likely do not have the speed to outrun the attack, but you can help get it out of the way.

The downside of course is that, once the bubble hits you, you need to quickly move, lest it spawn on top of you.

Another important factor to note is that by no means necessary should you attempt to cross a Cthulhunado. They deal about 100 damage, which will turn the fight in Duke Fishrons favor. Always use Wings to fly over them. Alternatively, use the Rod of Discord to teleport to the other side.

Expert Mode
When he drops below 9000 health, Duke Fishron will cloak himself in the background (which changes dramatically). He is hard to spot and he dashes at full speed. His contact damage is reduced, however it is easy to get hit by him multiple times in a row, as his high speed leave little time to react.

Play defensively, constantly zig-zagging up and down at 45 degree angles and using a homing weapon like the Possessed Hatchet or the Megashark with Chlorophyte Bullets so you can concentrate on moving while still dealing some damage. Make sure you keep changing direction as unpredictably as possible, and avoid settling into any repeating pattern of movement.

Star Veil can reduce the damage that he inflicts, and don't forget to Quick Buff your potions, especially the Regeneration Potion and Lifeforce Potion.

Terrain Preparation
The Arena must be located in the Ocean, unless you're very confident to beat an enraged Fishron, which is usually not recommended.


 * Make an arena out of . It should stretch at least across the ocean. Make it 3-5 platforms high; each row should be at least 20 blocks away from each other. Leave a gap at either side for maneuver however.
 * The Arena must be very tall: the Tornadoes are very tall, and thus, it requires significant amount of flight time to go to the other side of it.

Gearing up
It's highly recommended to defeat Golem first if you haven't done already, as these tips will take that into account. If you have no idea how to reach Golem, check this Walkthrough section.

By this point, you should have 500 Health. If not, it's recommended to do so. You might need to beat at least one of the Mechanical Bosses in order to spawn.

Armor

 * For Melee characters, the is the best available. The  is better for offensive bonuses, while the  is better for those that can avoid taking hits frequently.
 * For Ranged characters, the is the strongest available.
 * The is the strongest for a Mage. The  should be used only when at low health to maximize damage output..
 * A Summoner should summon their minions while wearing and then equip  for an extra, although weaker minion and slightly higher defense.

Weapons
For Melee users:
 * are very useful for stealing life combined with decent damage. Also, the life steal works better on his second phase.
 * is useful to significantly lower Duke Fishron's defense.
 * The is a very powerful choice if you have defeated the Martian Madness already.
 * The also performs well, though not as well as the Influx Waver.
 * is also a good choice as its ability to spawn pumpkins works on the bubbles. It may not be the best for the whole fight, but it is definitely one of the best against the Bubbles.
 * Constantly throwing the or  while flying around can defeat him quickly.
 * is the best Yo-yo that can be used at this point.
 * When Duke Fishron shoots Bubbles, use to clear them.
 * The is somewhat low in damage, but it makes up for this by homing in on Fishron during the fight. Paired with a flask, the player can focus more on dodging Fishron while the tiny eaters attack and do damage over time. Accumulating a swarm of them before Phase 3 in Expert mode helps do burst damage against Fishron when he's visible.

For Ranged users:
 * If you have defeated the Martian Madness event, the, is an extremely powerful choice when used with Crystal bullets.
 * The, also does very well. Chain gun is significantly stronger, but requires Chlorophyte bullets to be used to its full potential.
 * The is very useful with its extremely high  and splitting arrows, dealing damage to the Sharknadoes as well.
 * Ichor.png Ichor Arrows or Ichor Bullets will reduce his defense.
 * The is powerful against him, if you have defeated the Frost Moon.
 * The with Ichor or Holy arrows can perform excellentely against him.
 * The is very effective.
 * The is very effective with Chlorophyte Bullets.

For Magic users:
 * The is a very strong due to its excellent DPS, alhough it requires you to get closer than with other weapons.
 * The spell is helpful as it reduces his defense.
 * The does a lot of damage and is also a good choice.
 * The is very good for attacking while he is stationary.
 * The Laser Machine Gun can be used if the player has already defeated the Martian Madness.
 * The Magnet Sphere can deal lots of damage and only needs to be casted once in a while.

For Summoners:
 * Due to the ability to always have at least one Minion, or two with access to a Bewitching Table, summoning a minion prior to Duke Fishron may be helpful. However, due to his significant defense, weaker minions should be avoided; and due to his extreme speed, slower minions or those who use slower projectiles will be similarly ineffective. The Optic Staff, Xeno Staff, and especially the Deadly Sphere Staff can be quite helpful.
 * Maximize summon damage with buffs from food and potions, armor, and accessories when summoning minions, as the minions retain the increased damage even if the equipment is removed, until the minions are unsummoned or replaced.

Accessories

 * are a must have for the fight. The can make them significantly faster, making it easier to get over the Cthulhunadoes and dodging his attacks while flying.
 * The Master Ninja Gear, Shield of Cthulhu, or Tabi are incredibly useful for doging its attacks with their dashing capabilities.
 * Accesories that increase damage are a must have for ending the battle sooner. The best choices include the Celestial Shell or Stone, Destroyer Emblem, Mechanical Glove, and Sniper Scope.
 * Cross Necklace or Star Veil is recommended as the boss speed might cause several heavy hits on characters should the boss catch the player. The Sharknados may also flank the player hitting them consecutively especially on Duke Fishron's second phase.
 * Characters with Spectre Armor should consider using Magic Cuffs or Celestial Cuffs, as the damage dealt by Duke Fishron's attacks will often times completely restore their MP, allowing them to attack constantly while restoring HP. Care should be taken as the boss' high attack can make quick work of reckless players.
 * If you are using The Eye of Cthulhu or another yoyo, use a Yoyo Bag.
 * Charm of Myths will both allow for increased regen and reduced time for the Potion Sickness debuff.
 * The mount is a good replacement for Wings and can be better as it provides infinite air time. Unlike Wings however, it's much slower and can't be used with a dash.

Potions and Buffs
As with any other Hardmode boss, it would be useful to prepare the following potions:
 * Inferno Potion is highly recommended as it will destroy the Detonating Bubbles Fishron spawns before they reach the player..
 * Regeneration Potion and Ironskin Potion to survive. Two of each will last enough.
 * Endurance and Lifeforce potions for even greater survivability.
 * Any food item that can provide the Well Fed buff is very welcome.
 * Swiftness Potion helps you a lot to evade the Duke and its attacks.
 * Wrath and/or Rage Potions for a boost in damage output.
 * Magic Power and Mana Regeneration potions are a must for Magic users.
 * If a player has no arena, they can just use Water Walking Potions.
 * Gravitation Potions can free up an accessory slot, but it's recommended to use Featherfall Potions with them.
 * Melee characters should use the Tipsy debuff and the Flask of Ichor if available.
 * If you are facing him at night, a Shine Potion, Night Owl Potion, and Hunter Potion will help a lot so that you don't have to worry about visibility.

Minecart Strategy
This strategy differs from others in that it doesn't use skybridge, replacing it with looped minecart track above the ocean, so the player won't have to deal with his enraged behavior. It does, however, need some more work than other ones, especially when building arena.

Materials

 * 600-1200 normal minecart tracks for building loop + 2 booster tracks
 * Any kind of hammer

Arena Preparation
The essence is to make looped minecart track approx. 60 tiles above Ocean itself. It should consist of at least 600 tiles; while shape is pretty loose, it should have at least two places in which player drastically changes altitude, as well as at least 100 tiles long flats.

One should also make a "Starter" - a short molo with boosters, from which player will summon Duke Fishron and quickly escape to the loop.

It should be noted also that arena shouldn't exceed Ocean biome.

Execution
When everything's done, player should sit in a minecart on "Starter" and summon the Fishron. As soon as it's done, one should quickly go to loop (boosters will help). At this point, everything that remains is to shoot Fishron while maintaining speed on track, healing a/o replenishing mana when needed. Some tips:
 * Use a homing weapon, especially if your arena is pretty large. Fishron will spend most time off-screen, and high speed will often change directions you're facing.
 * Though stock minecart shouldn't be used, Mechanical Cart is not a good choice. Even though with it provides defense bonus, as well as speed to avoid Fishron's charges, it can easily outrun him causing Fishron to despawn, which is possible on larger arenas. Higher speed means also that you will more often run into Sharknados.
 * Try to make arena consisting of approx. 800 tiles, but don't make it horizontally-long. If you do so, Fishron will frequently run into you, and Cthulunados in his second stage will quickly kill you as there won't be any way to dodge them.

Spike Strategy
This strategy exploits invincibility frames obtained with the Cross Necklace by standing on a Spike. The Spike will do very little damage to a player with high enough defense, while the Cross Necklace will make it so the player is invincible for most of the fight. This strategy doesn't work in 1.3 or higher.

Enraged Anti-Gravity Hook Strategy
When Enraged, Duke Fishron is much faster and does much more damage. But with this stategy, this strength can be turned into a weakness. What you must do is get an Anti-Gravity Hook and place one or more platforms in the air. After fishron becomes enraged, you use your Anti-Gravity Hook in the platform and start using it to spin in a circle. This makes it possible to dodge all attacks. Keep in mind that this strategy only works with enraged Duke Fishron, because in his enraged behavior he will do nothing but attempt to ram you. Then you use the hook on the platform, start spinning and dodge his charges.