History:Duke Fishron

Main article: Duke Fishron

2.0.1.003: Now has 99% damage reduction during phase transitions during Boss Rush.

2.0.1.002:
- Nerfed health from 105,625 / 126,750 / 177,450 / 161,604 / 226,248 to 100,000 / 120,000 / 168,000 / 153,000 / 214,200 .
- Fixed its vulnerability to Resurrection Butterfly applying to Lunatic Cultist instead.

1.5.1.003:
- Buffed health in Revengeance Mode from 152,100 to 177,450 .
- No longer becomes invulnerable when transitioning between phases, and instead gains 47.5% damage reduction.
- Now drops 75 .
- Fixed its health bar functioning incorrectly in Malice Mode.

1.5.1.001:
- Buffed health from 50,000 / 60,000 / 117,000 to 105,625 / 126,750 / 152,100 .
- Buffed Sharknado damage from 80 / 100 / 116 / 124 to 80 / 100 / 184 / 200 .
- It and its Sharkrons are now vulnerable to electricity and sickness debuffs, but resistant to water and heat debuffs.
- Now drops Shrimpy Truffle regardless of world difficulty.

1.5.0.001:
- Buffed Revengeance Mode health from 111,000 to 117,000 .
- Nerfed Boss Rush health from 2,900,000 / 3,480,000 / 6,438,000 to 290,000 / 348,000 / 643,800 .
- Nerfed phase 1 defense from 60 to 50.
- Nerfed phase 2 defense from 50 to 40.
- Nerfed phase 3 defense in Revengeance Mode from 37 to 0 .
- Buffed damage reduction from 10% to 15%.
- Sharkron no longer drops Hearts in Revengeance or Malice Mode.
- Sharknado sharks can no longer deal damage for the first 42 frames after they've spawned in.

1.4.5.004:
- Now gains new charging patterns as its health decreases during phase 3 in Revengeance Mode.
- Will also now continuously charge at the player when its health is below 20% in Revengeance Mode.
- Now transitions to phase 2 at 70% health instead of 66% and phase 3 at 40% instead of 20% / 33% .

1.4.5.003: Now has increased attack delay, no longer transitions to phase 2 at the start of the fight, and its map icon is now invisible for the entirety of phase 3 in Death Mode.

1.4.5.001: Now takes 135% damage from Resurrection Butterfly instead of 200%.

1.4.3.001:
- Nerfed phase 1 contact damage from 100 / 140 / 175 / 201 to 100 / 140 / 161 / 173 .
- Nerfed phase 2 contact damage from 120 / 201 / 251 / 288 to 120 / 201 / 231 / 249 .
- Nerfed phase 3 contact damage from 184 / 230 / 264 to 184 / 211 / 228 .
- Nerfed small Sharkron damage from 100 / 150 / 187 / 215 to 100 / 150 / 172 / 186 .
- Nerfed large Sharkron damage from 120 / 180 / 225 / 258 to 120 / 180 / 206 / 223 .
- Nerfed Detonating Bubble damage from 100 / 150 / 187 / 215 to 100 / 150 / 172 / 186 .
- Nerfed Sharknado damage from 80 / 100 / 125 / 143 to 80 / 100 / 114 / 124 .
- Nerfed Cthulhunado damage from 160 / 200 / 250 / 287 to 160 / 200 / 229 / 248 .
- Death Mode now causes it to transition into Phase 2 immediately instead of at 66% health.
- Increased charge speed and frequency in Death Mode.

1.4.2.105:
- Revengeance Mode changes:
  - Nerfed Sharkron health modifier from 30x to 5x .
  - Now spawns a swarm of individual Sharkrons as well as bubbles while spinning.
  - Now spawns 3 Sharknadoes in phase 1 instead of 2. Each time he spawns the Sharknadoes, they appear in a different pattern.
  - Cthulhunados are now larger.
  - Increased speed.
- Map icon now disappears in phase 3 in Death Mode.
- Fixed the hitbox of Sharkron.

1.4.2.102:
- Sharknadoes and Cthulhunadoes are now able to hurt the player sooner.
- Fixed it being able to naturally spawn at the Sulphurous Sea in Death Mode.

1.4.2.101:
- Sharknadoes and Cthulhunadoes now don't hurt the player for a bit upon spawning.
- Fixed it not spawning in Death Mode.

1.4.2.001:
- Nerfed Boss Rush health from 5,000,000 to 2,500,000.
- Phase 3 now normally activates below 20% health instead of 33% health, and now activates at 30% health instead of 50% during Boss Rush.
- Reduced frequency at which Cthulhunadoes are spawned.
- Sharkrons can no longer be lifestealed off of.
- Now has a minimum coin drop count of 25 .

1.4.1.001:
- Buffed Boss Rush health from 4,400,000 to 5,000,000.
- Nerfed Boss Rush damage modifier from 3.25x to 2x.
- Decreased contact damage modifiers.
- Now spawns further away from the player during Boss Rush.
- No longer takes 25% damage from Crystal Bullet shards, Holy Arrow stars, split Terra Arrows, and split Terra Bullets.

1.4.0.001: Now transitions into phase 3 upon reaching 33% health in Revengeance Mode instead of 20%.

1.3.4.101:
- Buffed health modifier from 1.5x / 3.175x to 1.85x / 3.525x .
- No longer has 35% damage reduction.

1.3.4.001:
- Nerfed health modifier from 1.9x / 3.2x to 1.5x / 3.175x .
- Now drops Duke Fishron (lore item).
- Now takes 25% damage from Crystal Bullet shards, Holy Arrow stars, split Terra Arrows, and split Terra Bullets.

1.3.3.001: Now removes the early-Hardmode nerf to enemy health and damage when defeated.

1.2.4.002:
- Changed health modifier from 1.65x / 2.3x to 1.9x / 2.2x .
- Sharkrons now gain a 30x health modifier in all modes.

1.2.3.002:
- Now gains a 2.3x health modifier in Death Mode.
- Now enters phase 3 upon reaching 50% health in Death Mode.

1.2.1.004: Buffed Revengeance Mode health modifier from 1.5x to 1.65x .

1.2.0.002:
- Now inflicts Marked for Death for 3 seconds in Revengeance Mode.
- Detonating Bubble now inflicts Marked for Death for 6 seconds in Revengeance Mode.
- Sharkron now inflicts Marked for Death for 3 seconds in Revengeance Mode.

1.2.0.001:
- Now gains a 1.5x health modifier in Revengeance Mode.
- Increased speed.
- Now gains extra defense when performing certain attacks.
- Now has a 2% chance to drop Laudanum or Stress Pills in Revengeance Mode.

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