Thallasion, Shaper of the Currents Model

Thallasion ingame

Category World Boss
Type Dragon
Primary Biome Open Seas
AI Type Dragon Boss
Item Drops
Item (Quantity) Rarity
Deep Sea Dragon Egg Fragment small Deep Sea Dragon Egg Fragment
Blueprint ID
Boss Thallasion

Thallasion is a large World Boss that spawns rarely in Open Seas biomes. When defeated, it drops several Deep Sea Dragon Egg Fragments based on the difficulty of the world, which can be used to craft Thallasion, Shaper of the Currents at the Dragon Crucible.



The dark blue water biome that always guarantees Thallasion's lair to spawn.


The exterior of Thallasion's lair, located in about the middle of the biome.


Inside Thallasion's lair.

Like other dragon bosses, Thallasion has significantly more health and damage compared to dungeon bosses in the same difficulty, meaning it's best approached with a group of players at the matching power level.

As Thallasion naturally spawns underwater, fighting it may become more difficult as the players' movement and attack speed will be reduced.

It can perform three attacks:

  • Bite: Thallasion lunges out and bites a nearby player.
  • Tidal Wave: Thallasion jumps up and flaps its wings to do an aerial attack to a nearby player.
  • Acid Spread: Thallasion roars and sprays acid projectiles into the air. The projectiles will target a nearby player and drop a 2x2 block of acid, which can then flow further outwards. This acid will harm players in the block (very similar to lava blocks) and heals Thallasion on contact.

Drop Table

The number of Deep Sea Dragon Egg Fragments dropped varies based on the difficulty Thallasion is defeated in:

Uber World Amount
Uber-3 1
Uber-4 2
Uber-5 2
Uber-6 2
Uber-7 3
Uber-8 4
Uber-9 5


  • The boss is massive in size, so it is easy to spot.
  • Thallasion grants experience depending on the world you are in and drops 2 pieces of gear and the appropriate amount of Key Fragments of that world (very similar to the loot of a Lair Chest).
  • Thallasion can also spawn in rare Dungeons representing large mounds of sand in the Open Seas; destroy the blocks downward to go directly to a room with Thallasion.
    • Despite being similar to a dungeon, with set terrain and a quest popup, it does not appear on the map, nor does it have any monsters or bosses except for Thallasion.
  • Thallasion can also spawn in a variant of the Open Seas, which appears much darker than usual on the map and has a single guaranteed dungeon with Thallasion.



  • This enemy uses most of the same model as the mount Dracocolatl, the Mellower, except for one part (c_mt_dragon_deepsea_body_03, changed to c_mt_dragon_deepsea_body_03alt) to remove the saddle the mount uses.
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