The Deep Tide
Under the Ocean biome lies the Deep Tide, a side tier of tier 4: a drowned kingdom in five zones of falling light. Its story is the main arc's middle: a kingdom that traded its sky for the deep, and lost both.
"A kingdom sleeps under the sea past [place]."
"The roots remember what the king forgot."
Zones
| Zone | Creatures | Fish | Sites |
|---|---|---|---|
| Shallows | Reef Stalker | sunken ruins | |
| Kelp Forest | Kelp Lurker, Siren | Kelp Wrasse | kelp grove |
| Coral Reach | Reef Stalker, Siren, Abyssal Angler | Pearl Snapper | coral city |
| Open Deep | Reef Stalker, Abyssal Angler, Abyss Eel | Lanternfish, Leviathan Grouper | trench sites |
| Abyssal Trench | Abyssal Angler, Abyss Eel | Lanternfish | abyssal well ring |
Breathing
A diver has 30 s of breath, then loses 10 hp per second. A swimmer at zero stamina drowns slowly. Gillweed brew (5 minutes), the Bubble Charm (halves drain) and the Bubble Saddle (quarter drain) are the answers; the great answer is the Ocean Necklace.
The Ocean Necklace
Ocean Necklace is dropped only by the Drowned Crown, the unique arena boss of the Deep Tide. It gives water breathing and a dolphin swim (8 m/s with a 14 m/s dash and a breach out of the water), and it lifts the underwater weapon limits.
The Tide Altar
The tide station builds the sea's gear from coral, pearls, kelp, biolume and moonsilver:
| Item | T | Recipe |
|---|---|---|
 Pearlsteel Trident | T3 | 7 Iron Bar + 3 Ancient Bark + 1 Ooze Gel + 1 Mire Pearl (L1) |
 Abyssal Trident | T5 | 7 Sunsteel Bar + 3 Fine Wood + 1 Amber + 1 Basalt (L2) |
 Tidequeen's Trident | T7 | 7 Voidsteel Bar + 3 Umbral Wood + 1 Dusk Crystal + 1 Dawnstone (L2) |
 Anglerlight Lure | T4 | 1 Angler Lure + 2 Kelp (L1) |
 Reef Chum | T4 | 1 Reef Fang + 3 Entrails (L1) |
| Deep Squid | T5 | 1 Biolume + 2 Kelp (L2) |
| Coral Saddle | T4 | 8 Coral + 6 Kelp + 2 Pearlstone (L1) |
| Bubble Saddle | T5 | 1 Coral Saddle + 4 Biolume + 4 Pearlstone (L2) |
| Manta Harness | T6 | 8 Biolume + 10 Kelp + 3 Starmetal Bar (L3) |
| Coralwood Staff | T4 | 8 Coral + 2 Pearlstone + 6 Kelp + 1 Biolume (L1) |
| Pearl Wand | T4 | 4 Coral + 1 Pearlstone + 1 Biolume (L1) |
| Moonwater Staff | T6 | 1 Coralwood Staff + 6 Pearlstone + 4 Biolume + 2 Skyglass (L2) |
| Abyssal Pearl | T5 | 1 Tide Pearl + 4 Pearlstone + 3 Biolume (L2) |
| Pearlscale Mail | T4 | 10 Coral + 3 Pearlstone + 8 Kelp + 2 Moonsilver Bar (L1) |
| Bubble Charm | T4 | 2 Pearlstone + 4 Kelp + 4 Shell Sand (L1) |
| Tideward Draught | T4 | 3 Kelp + 1 Pearlstone + 1 Gillweed (L1) |
| Harpoon Bolt | T4 | 2 Coral + 1 Moonsilver Bar + 2 Kelp (L1) |
What lives there
Tide magic (Riptide, Healing Spring, Whirlpool, Tidal Wave) and the trident line are the sea's arms. Tameable: Glimmer Otter, Reefstrider, Abyssal Manta. Ships sail above it; the shipwright builds a raft, a reedrunner and a moonkeel.