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"Rusty Seas Update"
Release date April 15, 2020
Music Mod version (music)
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Version history  •  All patches

The (or update added several expansions to the Sulphurous Sea along with a few other items and balance changes. The update is also notable for the name change of the Bumblebirb into The Dragonfolly.




  • Toxic Bubbles from the Sulphurous Sea no longer appear while a boss is alive.

Aquatic Scourge

Astrum Aureus

Astrum Deus

  • Worms now take 10% damage from Aerial Bane instead of 20%.

Brimstone Elemental

  • Changed laser telegraph from dusts to a line.
  • No longer drops Souls of Fright.


  • Now charges twice after every set of fireballs and lasers fired in phase 2 in Revengeance Mode.


The Destroyer

  • Reduced Frozen and Chilled time from frost lasers.
  • Now takes 38% damage from Spent Fuel Container instead of 33.33%.
  • Now takes 10% damage from Brimstone Sword's projectiles and 1% damage from explosions.

The Dragonfolly

  • Red Lightning Aura no longer deals damage until fully materialized.

Duke Fishron

Lunatic Cultist

  • Now takes 75% damage from Resurrection Butterfly.

The Old Duke

  • Tooth Ball teeth now have less lifespan.
  • Sulphurous Sharkrons no longer deal damage until fully visible.
  • Updated resistances:

Profaned Guardians


Storm Weaver

Other NPCs

  • Charred Slime now spawns after defeating Brimstone Elemental instead of Plantera.
  • Flak Crab now only spawns underwater.
  • Nuclear Toad now spawns less frequently.
  • Town NPCs now have an icon above them when new items are available in shops. They can be turned off via configuration options.
  • The Abominationn from the Fargo's Mutant Mod can now cancel the Acid Rain event and sells the consumable Caustic Tear after it has been defeated.
  • The Sea King now sells the consumable Caustic Tear after the Acid Rain is defeated.
  • Reduced the amount of kills to clear the first two tiers of the Acid Rain event from 180 kills to 90 in Tier 1 and 125 in Tier 2.
  • Nerfed Tier 1 Water Leech's damage from 30 / 51 Expert Mode to 20 / 34 Expert Mode.



Balance and Reworks

Balance Changes

  • Added stealth strike effects to Prismalline and Snap Clam.
  • Flails no longer count as true melee weapons.
  • Nerfed Barinautical's use time from 6 to 12, and use delay from 15 to 20.
  • Buffed Brimlance's damage from 75 to 100.
  • Nerfed Clam Crusher's damage from 140 to 100.
  • Buffed Darklight Greatsword's damage from 55 to 75.
  • Nerfed Endo Hydra Staff's damage from 2563 to 800, but it now grants enemies 10 local immunity frames.
  • Entropy's Vigil now requires 2 minion slots to summon the whole trio. Having 1 minion slot left will only summon Calamitamini. Buffed damage from 27 to 35.
  • Nerfed Eutrophic Scimitar's projectile damage from 100% base damage to 70%.
  • Buffed Excalibur Shortsword's damage from 55 to 70.
  • Nerfed Flarewing Bow's damage from 25 to 20, and use time from 28 to 29.
  • Nerfed Forsaken Saber's projectile damage from 100% base damage to 80%.
  • Buffed Frostbrand's damage from 53 to 81.
  • Nerfed Hallowed Rune, stars now deal 33% damage and have a 1 second cooldown before re-appearing.
  • Buffed Hellion Flower Spear's damage from 67 to 120.
  • Buffed Inferna Cutter's damage from 85 to 100, and critical strike chance from 4% to 14%.
  • Buffed Phoenix Blade's damage from 95 to 120, and use time from 28 to 26.
  • Resurrection Butterfly now requires 2 minion slots to summon the whole duo. Having 1 minion slot left will only summon the Pink Butterfly. Buffed damage from 25 to 65.
  • Nerfed Roxcalibur's damage from 200 to 120.
  • Nerfed Snap Clam's debuff damage from 17.5 per second per clam to 7.5 per second per clam.
  • Nerfed Spent Fuel Container's damage from 69 to 50, and use time from 28 to 35.
  • Buffed Starnight Lance's damage from 68 to 95, and beam now pierces twice instead of once.
  • Buffed Storm Saber's damage from 42 to 68. It now additionally fires another beam from above.
  • Nerfed Submarine Shocker's damage from 70 to 60.
  • Buffed True Caustic Edge's damage from 42 to 100, and projectile now gains a 25% increase to damage per bounce.
  • Nerfed Vile Feeder, minions now spawn 1-2 mini-eaters instead of 1-3.


  • The Dance of Light now fires a flurry of light blades instead of white splitting flares, causing a flash of light to erupt after 300 hits. Buffed damage from 700 to 2077, critical strike chance from 4% to 24%, and mana cost from 9 to 6. Nerfed velocity from 30 to 14.
  • Nerfed Draedon's Heart's passive damage boost from 10% to 5%. It now inherits the reworked effects of Laudanum and Stress Pills below:
    • Laudanum no longer grants stat boosts or immunity to the Horror debuff. It now causes Horror to last twice as long, but provide the player with several positive buffs instead of harming the player.
    • Stress Pills no longer grant damage boosts and nerfed defense boost from 8 to 4. It now makes hits during a boss fight only remove half the Adrenaline Meter instead of the full meter.

Tier Changes

Additional Changes