History:The Old Duke

Main article: The Old Duke

2.0.3.007:
- Now deals no contact damage during phase transitions.
- Tooth Balls and Sulphurous Sharkrons can no longer be homed in on.
- Fixed its bestiary entry using the wrong apostrophe.
- Fixed Mutated Truffle still being guaranteed to drop from the Treasure Bag.

2.0.3.002:
- Sulphurous Sharkron and Tooth Ball are now affected by the Boss Health Boost Percentage configuration option.
- Changed the words "Auric Dragons" and "Auric Soul" in its bestiary entry to be lower case.

2.0.3.001:
- Buffed health from 495,000 / 792,000 / 950,400 / 1,188,000 / 1,425,600 to 500,000 / 800,000 / 960,000 / 1,200,000 / 1,440,000 .
- Removed Sulphurous Sharkron's bestiary entry.

2.0.2.002:
- Changed Boss Checklist Mod despawn message from "The old duke disappears amidst the acidic downpour." to "The old duke retreats further into the acidic downpour."
- It and Sulphurous Sharkron now properly display vanilla debuff colors and Hunter Potion effects.

2.0.2.001:
- Sulphurous Sharkron and Tooth Ball now have gores.
- Changed Bestiary entry from "Despite appearing old and decrepit, it clings to life. It does not seem native to the polluted sea, yet it has taken its place as its apex predator." to "One of the first descendants of the Dragons, its reign as the apex sea monster has been long forgotten. However, its power is still immense due to its heritage."

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

2.0.1.002: Increased vortex pull strength by 25% but it can no longer affect vertical movement.

2.0.0.001:
- Now plays "Duke Fishron" instead of "Boss 1" if the Calamity Music Mod is disabled.
- Tooth Balls now burst into 6 gravity-affected spikes identical to ones spawned by Trilobite instead of 4 homing teeth identical to ones spawned by Aquatic Scourge.
- Decreased fall acceleration of Trilobite Spikes by 60%.

1.5.1.003:
- Now drops 4 .
- Buffed health from 412,500 / 660,000 / 792,000 to 495,000 / 792,000 / 950,400 .
- No longer becomes invulnerable while transitioning between phases, and instead gains 25% damage reduction.
- Fixed its health bar functioning incorrectly in Malice Mode.

1.5.1.001:
- Buffed phase 1 contact damage from 160 / 224 / 280 / 294 to 160 / 288 / 324 / 342 .
- Changed phase 2 contact damage from 192 / 268 / 336 / 352 to 176 / 316 / 356 / 376 .
- Changed phase 3 contact damage from 208 / 291 / 364 / 382 to 192 / 345 / 388 / 410 .
- Buffed The Old Duke's gore damage from 140 / 220 / 240 / 256 to 170 / 296 / 324 / 340 .
- Buffed Sulphurous Sharkron damage from 180 / 270 / 300 / 315 to 180 / 288 / 328 / 344 .
- Buffed Sulphurous Sharkron's gore damage from 140 / 220 to 170 / 296 / 324 / 340 .
- Buffed Tooth Ball damage from 180 / 270 / 300 / 315 to 180 / 288 / 328 / 344 .
- Buffed Tooth Ball's tooth damage from 140 / 220 to 170 / 296 / 324 / 340 and cloud damage from 140 / 220 to 180 / 316 / 348 / 364 .
- It, Sulphurous Sharkrons, and Tooth Balls are now vulnerable to electricity debuffs, but resistant to water, sickness, and heat debuffs.
- Now drops Mutated Truffle regardless of world difficulty.

1.5.0.001:
- Nerfed health from 750,000 / 1,200,000 / 1,600,000 to 412,500 / 660,000 / 792,000 .
- Nerfed Boss Rush health from 4,000,000 / 6,400,000 to 400,000 / 640,000 .
- No longer immune to any debuffs except Confused, Pearl Aura, Irradiated, and Sulphuric Poisoning.
- Will now look in the direction that it is about to dash instead of directly at the player when telegraphing its dash.
- The tired sound effect can now only be heard by the player that it has targeted.
- Tooth Balls, Gas Clouds, and Teeth projectiles now use the same immunity frame timers.
- Toxic cloud projectiles now use a circular hitbox.
- Tooth Balls no longer drop Hearts in Revengeance or Malice Mode.
- Can no longer be color adjusted through external means.
- Increased despawn range by 50 blocks for a total range of 550 blocks.
- Now deals 75% less contact damage while tired.
- Now takes 80% damage from Time Bolt and 40% damage from The Last Mourning's projectiles.
- Now drops 70 instead of 75 .
- Now inflicts Irradiated for 8 seconds and can no longer inflict Bleeding, Feral Bite, and Poisoned. Toxic cloud projectiles now inflict Irradiated for 4 seconds instead of Venom for 5 seconds.
  - Tooth Balls now inflict Irradiated for 4 seconds and can no longer inflict Bleeding, Feral Bite, and Poisoned.
  - Sulphurous Sharkrons now inflict Irradiated for 4 seconds and can no longer inflict Bleeding, Feral Bite, and Poisoned.
- Now drops Supreme Healing Potions.

1.4.5.004:
- Now spends less time preparing to dash during phase 3 and now dashes more aggressively while enraged instead of becoming invulnerable.
- Significantly decreased pre-charge velocity and acceleration.
- Now takes 55% damage from Crescent Moon's flail instead of 20%.
- Sulphur clouds no longer have increased duration in Death Mode.
- Fixed desyncs and infinite spinning in multiplayer.

1.4.5.003:
- Nerfed phase 1 contact damage from 200 / 320 / 352 / 371 to 200 / 224 / 280 / 294 .
- Nerfed phase 2 contact damage from 288 / 461 / 507 / 534 to 192 / 268 / 336 / 352 .
- Nerfed phase 3 contact damage from 264 / 422 / 464 / 489 to 208 / 291 / 364 / 382 .
- Nerfed Sulphurous Sharkron damage from 180 / 360 / 396 / 417 to 180 / 270 / 300 / 315 .
- Nerfed Tooth Ball damage from 180 / 360 / 396 / 417 to 180 / 270 / 300 / 315 .
- Now teleports a bit further away from the player in phase 3.
- Now has increased attack delay and no longer transitions to phase 2 at the start of the fight in Death Mode.

1.4.5.001:
- Nerfed base damage reduction from 60% to 50% and base defense from 140 to 100.
- Now has 0% damage reduction and 0 defense while tired instead of 15% and 35 respectively.
- Tooth Balls now speed up when farther from the player.
- No longer takes 20% damage from Galileo Gladius projectiles.
- Fixed a mod conflict that caused him to fire an absurd amount of projectiles.
- Fixed an issue that prevented him from being affected by the Boss Health Percentage Boost configuration slider.

1.4.4.002:
- Tooth Ball teeth now have less lifespan.
- Sulphurous Sharkrons no longer deal damage until fully visible.
- Updated resistances:
  - Now takes 20% damage from Galileo Gladius instead of 40%.
  - Now takes 20% damage from Crescent Moon instead of 60%.
  - Now takes 60% damage from Soul Edge instead of 75%.

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