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"The ocean depths are trembling..."

The Abyss is an aquatic biome added by the Calamity Mod which spawns upon world creation. It is located under the Sulphurous Sea on the Dungeon side of the world through a chasm on the seafloor. It is extremely deep, dark, and perilous, filled with deadly enemies, which increase in strength as the biome grows deeper. Because many enemies in the Abyss are initially passive, only becoming hostile when hit or when in close proximity to the player, stealthiness should be greatly prioritized while exploring the biome. The Abyss is divided into four distinct layers, each with a different set of enemies that will spawn.

  • Layer 1 is empty and open, populated by enemies that are relatively benign but still hostile, potentially threatening to unprepared players. This layer is recommended to be explored after defeating Skeletron.
  • Layer 2 contains islands, either connected to the side of the Abyss or floating in the middle. The middle islands always have a "house" sitting on top of them, which holds a locked Shadow Chest containing unique Abyss weapons and accessories. This layer is recommended to be explored during Hardmode or, if prepared enough, late Pre-Hardmode.
  • Layer 3 is identical to layer 2 in terms of structures, although the enemies present are significantly more dangerous. At this depth, the player's vision will become completely darkened without the aid of special equipment such as the Lumenous Amulet. This layer is recommended to be explored in late Hardmode or after defeating Moon Lord.
  • Layer 4 opens back up into a large empty space before the Abyss closes in at a point. A shrine containing the Terminus can be found here. The most dangerous enemies are present in this layer, and as such, it is only recommended to explore after defeating several Post-Moon Lord bosses, namely the Polterghast.

The upper two layers of the Abyss are mostly composed of Abyss Gravel, with Abyss Gravel Walls as a background. The third layer begins replacing Abyss Gravel with Voidstone and Voidstone Walls, while the fourth layer is completely made out of Voidstone. It also contains Planty Mush, Tenebris and Chaotic Ore in the 2nd and 3rd layers. Several Pots are scattered around the islands, containing several useful drops.

Contents[edit | edit source]

Characters Unique Treasures Unique Drops

Layer 1:

Box JellyfishBox Jellyfish
Moray EelMoray Eel

Layer 1 and 2:

Devil FishDevil Fish

Layer 1, 2 and 3:

Toxic MinnowToxic Minnow

Layer 2:

Luminous CorvinaLuminous Corvina

Layer 2 and 3:

Giant SquidGiant Squid

Layer 3:

Colossal SquidColossal Squid(Miniboss)
Mirage JellyMirage Jelly

Layer 3 and 4:

EidolistEidolist(in Hardmode)
Eidolon Wyrm (Juvenile)Eidolon Wyrm (Juvenile)(Miniboss)
Eidolon Wyrm (Adult)Eidolon Wyrm (Adult)(Miniboss)
Gulper EelGulper Eel
Reaper SharkReaper Shark(Miniboss)

Layer 4:

Bobbit WormBobbit Worm
Chaotic PufferChaotic Puffer
From Shadow Chests:
Anechoic PlatingAnechoic Plating
Ball O' FuguBall O' Fugu
Black AnurianBlack Anurian
Depths CharmDepths Charm
Herring StaffHerring Staff
Iron BootsIron Boots
Strange OrbStrange Orb
Torrential TearTorrential Tear

From Pots:

Spelunker GlowstickSpelunker Glowstick (2-5 / 3-11)
Hellfire ArrowHellfire Arrow (10-20)
Anechoic CoatingAnechoic Coating
Hadal StewHadal Stew
Sticky DynamiteSticky Dynamite
BombBomb (5-8)
Endurance PotionEndurance Potion
Flipper PotionFlipper Potion
Gills PotionGills Potion
Gravitation PotionGravitation Potion
Heartreach PotionHeartreach Potion
Inferno PotionInferno Potion
Lifeforce PotionLifeforce Potion
Magic Power PotionMagic Power Potion
Obsidian Skin PotionObsidian Skin Potion
Regeneration PotionRegeneration Potion
Shine PotionShine Potion
Spelunker PotionSpelunker Potion
Water Walking PotionWater Walking Potion

From Shrine in Layer 4:


From Cuttlefishes and Reaper Sharks:

Cloaking GlandCloaking Gland

From Bloatfishes, Luminous Corvinas, Eidolon Wyrm (Juvenile) and Eidolon Wyrm (Adult):


From many Abyss enemies
after defeating Calamitas or Plantera:

Depth CellsDepth Cells

From Eidolon Wyrm (Juvenile) and Eidolists
after defeating Calamitas or Plantera:

Lunar Cultist HoodLunar Cultist Hood
Lunar Cultist RobeLunar Cultist Robe

From Mirage Jellies:

Life JellyLife Jelly
Mana JellyMana Jelly
Vital JellyVital Jelly

From Devil Fish
after defeating Golem:


From Devil Fish and Chaotic Puffers
after defeating Golem:

Chaotic OreChaotic Ore

From Eidolon Wyrm (Juvenile)
after defeating Polterghast
and Eidolon Wyrm (Adult):

Eidolic WailEidolic Wail
Soul EdgeSoul Edge

From Colossal Squids
after defeating Polterghast:

Calamari's LamentCalamari's Lament

From Reaper Sharks
after defeating Polterghast:

Reaper ToothReaper Tooth
The ReaperThe Reaper

From all Abyss enemies in Revengeance Mode:

Halibut CannonHalibut Cannon

From terrain:

Abyss GravelAbyss Gravel
Chaotic OreChaotic Ore
Planty MushPlanty Mush
Shadow ChestShadow Chest

From Fishing:

Abyssal AmuletAbyssal Amulet
Alluring BaitAlluring Bait
Planty MushPlanty Mush
Anechoic PlatingAnechoic Plating (in Hardmode)
Depths CharmDepths Charm (in Hardmode)
Iron BootsIron Boots (in Hardmode)
Strange OrbStrange Orb (in Hardmode)

Light Level[edit | edit source]

Without a sufficient level of light, the player's vision may be reduced (similarly to the Darkness debuff) or blackened completely (similarly to the Obstructed debuff), depending on how deep they've descended into the Abyss.

  • In Layer 1, the player's vision will be reduced unless they have a light level of 1 or higher.
  • In Layer 2, the player's vision will be blackened unless they have a light level of 1 or higher, and reduced unless they have a light level of 3 or higher.
  • In Layer 3, the player's vision will be blackened unless they have a light level of 3 or higher, and reduced unless they have a light level of 5 or higher.
  • In Layer 4, the player's vision will be blackened unless they have a light level of 5 or higher, and reduced unless they have a light level of 7 or higher.

The following items increase the player's light level. These values are cumulative, and stacking several of them at the same time is required for maximum vision in the Abyss.

Breath[edit | edit source]

The breath meter drains more quickly in the Abyss, with each deeper layer applying more severe breath loss. Players with zero breath in the Abyss will lose health far more rapidly than if they were drowning in normal water. Finally, the Crush Depth debuff is commonly inflicted by enemies in the Abyss and causes the player's breath to drain even quicker. These conditions make underwater breathing equipment a necessity for players wishing to explore the Abyss.

The first layer of the Abyss reduces the player's breath by 2 every tenth of a second, resulting in a net loss of 20 breath per second. Each layer beyond the first reduces the player's breath three times as quickly as the previous: the second layer takes away 60 breath per second, the third layer takes away 180, and the fourth takes away 540.

The Abyss ignores all items that normally grant permanent underwater breathing, such as the Gills Potion, Neptune's Shell, and the Ocean Crest. These items are still useful as they separately help reduce the breath loss the Abyss applies to the player.

Breath loss rate[edit | edit source]

The following items reduce how frequently the Abyss takes breath away from the player. These effects add together to create an overall delay multiplier that slows down the Abyss' breath loss:

  • Gills buff or Ocean Crest: +4
  • Any item which lets the player ignore water physics, as listed below: +5
  • The delay multiplier is capped at 50. The Abyss takes away breath DelayMultiplier + 1 times more slowly from the player.

    Breath loss amount[edit | edit source]

    The following items reduce the quantity of breath taken away by the Abyss. These effects do not multiply together. Rather, they add onto each other and create an overall percentage to reduce the Abyss' breath loss by:

    This percentage reduction is capped at 95%. At this cap the Abyss removes 20 times less breath from the player.

    Drowning damage[edit | edit source]

    A player drowning in the Abyss takes extra damage in addition to the vanilla game's health drain from drowning. More precisely, the Abyss reduces the player's health instead of their breath if their breath meter is empty. With no relevant equipment, drowning in the Abyss deals an extra 30 damage per second in Layer 1, 60 damage per second in Layer 2, 120 damage per second in Layer 3, and 240 damage per second in Layer 4. This damage is reduced by 30 per second if the Depths Charm or Abyssal Diving Gear is equipped; this damage is further reduced by 60 damage per second if the Abyssal Diving Suit is equipped. The extra drowning damage dealt by the Abyss is slowed down by all items which reduce the rate of breath loss.

    Defense[edit | edit source]

    Being in the Abyss decreases the player's defense, with more severe reductions occurring at the deeper levels. All of these defense reductions can be reduced to one-third effectiveness by equipping the Anechoic Plating or Abyssal Diving Suit:

    • Layer 1: -15 defense (-5 if wearing appropriate accessory)
    • Layer 2: -30 defense (-10 if wearing appropriate accessory)
    • Layer 3: -60 defense (-20 if wearing appropriate accessory)
    • Layer 4: -120 defense (-40 if wearing appropriate accessory)

    Unlike many defense reducing effects, the Abyss can reduce the player's defense below zero, causing them to take increased damage.

    Fishing[edit | edit source]

    Fishing in the Abyss will warrant different catches based on fishing power, and are as follows:

    Notes[edit | edit source]

    • Being in any layer of the Abyss below the first layer will disable natural life regen, much like the Bleeding debuff. This can be prevented by equipping the Depths Charm, Abyssal Diving Gear, or Abyssal Diving Suit.
      • Only the Abyssal Diving Suit will prevent bleeding in Layer 3. The bleeding effect cannot be prevented in Layer 4.
      • Equipping any of these accessories will also halve the amount of damage taken from running out of breath in the Abyss.
    • Attempting to use air pockets in the Abyss to regenerate air will deal a point of damage per tick to the player. This makes returning to the abyss after draining it challenging since the player will have to find some way to keep themselves submerged all the way down.
    • Empty Buckets and the Super Absorbant Sponge cannot be used in the Abyss.
    • Lava and Honey buckets cannot be placed in water inside of the Abyss.
    • It is possible that the entrances into the Shadow Chest rooms will be blocked, requiring the player to slowly mine through the Abyss Gravel to get into them.
    • Sometimes in Small or Medium-sized worlds, and very rarely in Large worlds, the Abyss will generate over the Dungeon.
    • It is possible to break holes into the Underworld from the Abyss. Doing so will drain the Abyss of water and may lead to the flooding of the entire Underworld.
    • Because Abyss Gravel leaks water naturally, should the Abyss be drained on accident, so long as said drain is plugged the Abyss will eventually fill back up over time.
    • The Abyss biome is defined by world position rather than the blocks present, meaning that any entering any water beneath the world's Dungeon-side Ocean will cause the player to be considered as inside the Abyss, and all of the related effects will occur, even if the world was initially generated without Calamity installed. However, this also means that an artificial Abyss cannot be created by relocating Abyss Gravel or any other Abyss blocks.
      • If the world was generated without Calamity installed, most of the Abyss's unique physical loot can still be obtained from other sources. The chest items and Planty Mush can be caught from Fishing, and Voidstone drops from several Abyss enemies. Tenebris, however, is unobtainable without a physical Abyss.
    • It is possible for the Abyss to overlap with the dungeon on small worlds, usually resulting in Abyss Gravel blocks or Voidstone blocking some of the Dungeon's pathways.
    • All non-Boss enemies in the Abyss are inflicted with the Crush Depth debuff causing a loss of 1500 health per second regardless of progression.
      • This does not affect enemies which are immune to Crush Depth, including all of the enemies native to the Abyss.

    Tips[edit | edit source]

    • While you can explore the entire biome even while in Pre-Hardmode, you are very unlikely to survive due to the intense pressure and strong enemies present in the deeper parts of the Abyss.
    • The Siren's Heart and the Shrimpy Truffle can prove very useful due to their increased mobility in water. The Cute Fishron mount is always wet and increases damage whereas the the Siren's Heart grants the Siren Speed buff. Both additionally slow the rate breath loss.
    • Do not use the Rod of Discord or Normality Relocator in the Abyss at any time. If you are affected with Chaos State while in the Abyss, a nigh-invincible Adult Eidolon Wyrm will spawn regardless of your progression in the game.
    • Using torches which can be placed underwater, such as the Cursed Torch, Ichor Torch or Abyss Torch can help with the darkness of the abyss.
    • To restock on air while exploring the Abyss, you can use a Portal Gun to quickly teleport between the surface and your current position. Set up a portal somewhere you can breathe beforehand, and whenever you need air, place the second color portal.
    • The player could dig to the left/right of the Abyss to regenerate breath in a Underground biome to avoid the rapid health loss that occurs when air bubbles are used in the Abyss.

    Trivia[edit | edit source]

    • The theme that is heard while in the upper two layers of the Abyss is Hadopelagic Pressure, which was composed by the artist DM DOKURO.
      • If the Calamity Music add-on mod is disabled, The Underworld's theme will play through all layers of the Abyss instead.
    • The theme that is heard while in the third layer of the Abyss is R'LYEH, which was made by wiki editor RoverdriveZ.
      • It was intended to be just a placeholder, but was kept due to positive reception from the community.
    • The theme that is heard while in the bottom layer of the Abyss is void, which was also composed by the artist DM DOKURO.
    • Some of the creatures in the Abyss are based off of the game Subnautica, though most are based on real life ocean creatures.
    • If you drown in the Abyss, the death message "[Playername]'s legs appeared where his/her head should be." shows, which is the death message when dying to damage caused by the Chaos State debuff.
    • The Abyss generates under the Dungeon-side Ocean in order to prevent conflict with the Thorium Mod's Aquatic Depths biome, which always generates under the Jungle-side Ocean.
    • The Abyss and the Sulphurous Sea is comparable to the Pelagic zone, the way the oceans layers are categorized, The Sulphurous Sea would be the Epipelagic zone, the first layer of the abyss being the Mesopelagic zone, the second layer being the Bathypelagic zone, the third layer being the Abyssopelagic zone, and the fourth and final one being the Hadopelagic zone.