Biomes

Abyss has 5 distinct biomes, each with unique fish, NPCs, and progression requirements. From the starting hub of Forgotten Deep to the hidden Angler Cave, this guide maps out every location, what you'll find there, and what you need to access it.

Biome Overview Map

Biome	Type	Key Features	Fish Count	NPCs
Forgotten Deep	Starting Point	Central hub, all basic shops	8	9
Ocean	Exploration	Gateway to other biomes, secrets	10	4
Ancient Sands	Exploration	Low visibility, exclusive mutations	9	4
Spirit Roots	Exploration	Largest map, progression-locked	10+	6
Angler Cave	Hidden Area	Requires quest completion to access	4	1

Forgotten Deep

"Once forgotten, now home."

Type: Starting Point

Forgotten Deep is the heart of the Abyss and the primary starting point for all players. It functions as a central hub where you'll find most of the essential service NPCs. The Kraken lives here in the center and sends you on your first missions.

Despite being the starting area, Forgotten Deep has a rich ecosystem including aggressive fish like the Barracuda (Epic). The sub-area Forgotten Dome contains the main shops for guns and tubes.

Forgotten Deep Features

Starting location for all new players
Central hub with essential NPCs
Contains the Forgotten Dome shop area
Dangerous yet rich ecosystem with unique fish

Forgotten Deep NPCs

NPC	Role	Description
Kraken	Quest Giver	Creature beyond abyss, the fish eater. Found in the middle of Forgotten Deep.
Virelia	Geode Cracker	Mage who uses magic to open geodes. Found near her Magic Cauldron.
David	Tube Seller	Located in the tube store.
Henry	Harpoon/Gun Seller	Retired diver, located in the harpoon store.
Richard	Bestiary NPC	Fishologist, Jeff's twin brother. Found near the leaderboards.
Billy	Storage	Storage guy. Found near a blue container.
Mr. Black	Quest/Shop	Dangerous cowboy. Sells oxygen pods and potions. Found near Billy.
Scientist	Teleporter	A genius scientist who made a teleporter. Near a blue porta potty.
Crab	Quest Giver	David's pet crab.

Forgotten Deep Fish

Fish	Rarity	Behaviour
Blue Tang	Common	Passive
Clownfish	Common	Passive
Tang	Common	Passive
Pufferfish	Uncommon	Passive
Salmon	Uncommon	Passive
Lionfish	Rare	Aggressive
Mahi Mahi	Rare	Passive
Barracuda	Epic	Aggressive

Ocean

"Endless blue serenity."

Type: Open Waters / Exploration Stage

The Ocean is the vast biome encountered after leaving Forgotten Deep. Nearly all adventurers must pass through these open waters to reach other biomes. It looks calm at first glance but hides secrets beneath the surface, including Bob's Room and Morveth's Cave.

The Ocean is home to fish required for many quests, making it an important area for progression. It's also where you'll find the Diver for delivery quests and the Lost Captain for the Angler Cave quest chain.

Ocean Features

Main passage connecting all biomes
Holds hidden areas: Bob's Room and Morveth's Cave
Contains quest-critical fish species
Numerous secrets for curious explorers

Ocean Sub-Areas

Bob's Room -- Hidden area unlocked by finding 15 ducks. Contains the Plunger Gun and Bath Tube shop.
Morveth's Cave -- Home to Morveth. Sells the Morveth's Treasure Gun.

Ocean NPCs

NPC	Role	Description
Diver	Delivery Quests / Shop	Former abyssian employee on a sunken submarine. Sells Zepline and Plane tubes.
Morveth	Quest/Shop	Mysterious crow-man. Located in Morveth's cave in the outer ocean.
Bob	Quest/Shop	Discord moderator. Found in his room outside Forgotten Deep.
Lost Captain	Quest Giver	Once a proud captain, now guides divers from his wrecked ship.

Ocean Fish

Fish	Rarity	Behaviour
Blue Tang	Common	Passive
Clownfish	Common	Passive
Pufferfish	Uncommon	Passive
Salmon	Uncommon	Passive
Sea Horse	Rare	Passive
Blobfish	Rare	Passive
Piranha	Rare	Aggressive
Shark	Epic	Aggressive
Sailfish	Epic	Aggressive
Bluefin Tuna	Legendary	?

Ancient Sands

"Endless sand, sunken bones. Something old sleeps here."

Type: Polluted Depths / Exploration Stage

Ancient Sands is where the waters become heavily polluted with sand, drastically reducing visibility. Navigation is difficult, forcing players to rely on instinct rather than sight. Despite these conditions, the biome is home to unique fish with exclusive mutations found only here.

The area contains Jeff's Cave (shop with guns, tools, and potions), Marcus' archaeology site, Grumpy Hank's Sand Tower, and a hidden tunnel leading to secrets.

Ancient Sands Features

Extremely sandy and polluted waters reducing visibility
Exclusive fish mutations found only in this biome
Multiple activities offering valuable rewards
Jeff's Cave shop with high-tier items
A hidden tunnel leading to secret areas

Ancient Sands NPCs

NPC	Role	Description
Jeff	Shopkeeper	Store owner. Located in Jeff's cave.
Marcus	Archaeologist / Shop	Researching an old fossil with Naomi and Noah. Found near a fossil.
Suspicious Fisher	Quest Giver	Stuck and lost in Abyss, always reading that book. On a pillar.
Grumpy Hank	Quest Giver	Former Crabfolk member. Located in Sand Tower.

Ancient Sands Fish

Fish	Rarity	Behaviour
Pompano	Common	Passive
Cod	Uncommon	Passive
Blackfin Tuna	Uncommon	Passive
Grouper	Rare	Passive
Scorpionfish	Rare	Aggressive
Cavefish	Epic	Passive
Shark	Epic	Aggressive
Bigmouthfish	Legendary	Passive
Ancient Shark	Legendary	Aggressive

Spirit Roots

"The heart of the deep, where the tree's roots weave through the seafloor."

Type: Ancient Depths / Exploration Stage

Spirit Roots appears serene and calm upon first entry, with gentle currents and glowing vegetation. This tranquility is deceptive -- the biome is filled with hostile enemy fish that pose a constant threat.

Spirit Roots is progression-locked. You must complete Isolde's quests to fully open the biome. Once opened, it's the largest map in the game with diverse sea creatures and winding tunnels full of surprises. The sub-area Spirit Root Hollow contains additional shops and NPCs.

Spirit Roots Features

Largest map in the game
Progression-locked behind Isolde's quests
Winding tunnels with secrets and challenges
Most diverse fish roster
Home to Legendary boss creatures (Dragonfish, Whale)

Spirit Roots NPCs

NPC	Role	Description
Isolde	Quest Giver	Gentle ghost, bounded to trees. Found in her Hollow.
Victor	Quest/Shop	Eternal ghost, gave his life to roots for power. Found in Hollow.
Lumi	Quest Giver	Cat's spirit. Found in a cave.
Golem	Quest Giver	Lonely rock creature. Lives in deep caves.
Isacc	Quest Giver	Spirit with his beloved Sunfish friend. Behind the big tree.
King Cat	Quest Giver	The Great King Cat, captured by the Kraken long ago.

Spirit Roots Fish

Fish	Rarity	Behaviour
Pacific Fanfish	Common	Passive
Jellyfish	Uncommon	Passive
Napoleon	Uncommon	Passive
Narwhal	Rare	Passive
Sunfish	Rare	Passive
Sailfish	Epic	Aggressive
Hammer Shark	Epic	Aggressive
Eyefish	Legendary	Passive
Dragonfish	Legendary	Aggressive
Whale	Legendary	Aggressive

Angler Cave

Type: Hidden Area

The Angler Cave is unlocked after completing the Lost Captain's full quest chain. It's a small, dark area with only four fish and one NPC, but it contains both the King Anglerfish (Mythical) and the Lightkeeper's shop selling endgame equipment.

Angler Cave Features

Hidden area, locked behind Lost Captain's quests
Dark environment
Only 4 fish species
Home to the Mythical King Anglerfish
Lightkeeper sells Ruined Gun and Ruined Tube

Angler Cave NPC

NPC	Role	Description
Lightkeeper	Quest/Shop	Mysterious shadowy figure. Sells ruined equipment bound with ancient magic.

Angler Cave Fish

Fish	Rarity	Behaviour
Blobfish	Rare	Passive
Piranha	Rare	Aggressive
Anglerfish	Rare	?
King Anglerfish	Mythical	Aggressive

Biome Progression Order

The intended progression path through biomes is:

Forgotten Deep (starting area, depth 0-50m)
Ocean (depth 50-375m) -- requires Pufferfish Tube or better
Ancient Sands (depth 275-460m) -- requires Boat Tube or better
Spirit Roots (depth 375-600m) -- requires Zepline Tube or better, plus Isolde's quests
Angler Cave (depth 600m+) -- requires Lost Captain's full quest chain completion

Tube Requirements by Biome

Biome	Minimum Depth Needed	Cheapest Viable Tube
Forgotten Deep	15m	Wooden Tube (Free)
Ocean	~180m	Pufferfish Tube ($2,850)
Ancient Sands	~275m	Boat Tube ($5,250)
Spirit Roots	~375m	Zepline Tube ($18,500)
Angler Cave	~600m+	Lost Spirit Tube ($168,750)

Frequently Asked Questions About Biomes

How do I get to Ancient Sands?

Upgrade your tube to at least a Pufferfish Tube (180m depth) or Boat Tube (275m depth), then swim through the Ocean past Forgotten Deep.

How do I open Spirit Roots?

Complete Isolde's quest chain in Spirit Roots. She's found in her Hollow and gives quests that progressively revive the trees, opening up more of the biome.

How do I get into Angler Cave?

Complete all 4 of the Lost Captain's quests at his wrecked ship in the Ocean. This is one of the hardest quest chains in the game, requiring rare mutated fish and hundreds of treasure chests.

Which biome has the most fish?

Spirit Roots has the most diverse fish roster with 10+ species, including three Legendary creatures (Eyefish, Dragonfish, Whale).

Which biome is best for making money?

Mid game: Forgotten Deep (Barracuda farming). Late game: Spirit Roots (high-value Legendary fish with mutations).