Abyssion, The Forgotten One

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Abyssion, The Forgotten One
Abyssion, The Forgotten One.png
Statistics
Type Boss
Environment Aquatic Depths
AI Type Abyssion, The Forgotten One AI
Max Life 46000 / 81000 (Total)
KB Resist 100%
Drops
Coins 5 Gold Coin.png 50 Silver Coin.png
Item (Quantity) Rate
The Incubator.png The Incubator
25%
Mantis Shrimp Punch.png Mantis Shrimp Punch
25%
Trench Spitter.png Trench Spitter
25%
Old God's Grasp.png Old God's Grasp
25%
Abyssion Mask.png Abyssion Mask
10%
Abyssion Trophy.png Abyssion Trophy
10%


Abyssion, The Forgotten One is a Hardmode, post-Plantera boss fought in the Aquatic Depths. The boss has multiple forms, each more powerful than the last.

Spawn[edit | edit source]

The Forgotten One does not spawn on its own and requires the player to kill Aquatic Hallucinations in the Aquatic Depths. They will drop Abyssal Shadows, which will inflict the False Presence debuff once for every one picked up. Upon reaching three stacks of the debuff, The Forgotten One will emerge. Multiple Abyssions cannot be summoned through this process.

Forms[edit | edit source]

Abyssion, The Forgotten One
(Shell)
Abyssion, The Forgotten One.png
Statistics
Type Boss
AI Type Abyssion, The Forgotten One AI
Damage 60 / 120
Max Life 26000 / 38000
Defense 30 / 40
KB Resist 100%
Abyssion, The Forgotten One
(Cracked)
Abyssion, The Forgotten One (Cracked).png
Statistics
Type Boss
AI Type Abyssion, The Forgotten One AI
Damage 60 / 120
Max Life 20000 / 28000
Defense 30 / 40
KB Resist 100%

Behavior[edit | edit source]

Attacks[edit | edit source]

  • While below 90% life, Abyssion will occasionally hide within his shell, greatly increasing his defense. When in his shell, he will rapidly barrage the nearest player with fast moving and heavy damaging spit projectiles.
  • While below 65% life, Abyssion will release large spinning whirlpools that deal massive damage to the player and knock them back, even if the hit player has an effect similar to the Cobalt Shield.
  • While below 55% life, Abyssion will start spawning five Abyssal Spawn every time he hides within his shell.
  • While below 50% life, Abyssion will release faded water ripples. These bounce along all walls, and stay within the area for 4 seconds.
  • Upon reaching 0 health, it transforms into its second Cracked stage. The transformation is notified with the status message, "Abyssion's shell violently cracks!"
  • While in this state, Abyssion will keep all of his previous attacks without the need of lost life. They will be quicker, deal more damage, and come out far more rapidly too.
  • Additionally, Abyssion will start releasing semi-homing slashes of dark magic, that attempt to blockade the players movements.

Summons[edit | edit source]

Image Name Condition
Abyssal Spawn.png Abyssal Spawn Below 45% life

In Expert Mode[edit | edit source]

Abyssion, The Forgotten One
(Released)
Abyssion, The Forgotten One (Released).png
Statistics
Type Boss
AI Type Abyssion, The Forgotten One AI
Damage 120
Max Life 15000
Defense 40
KB Resist 100%
Item (Quantity) Rate
Treasure Bag (Abyssion, The Forgotten One).png Treasure Bag (Abyssion, The Forgotten One)
• in Expert Mode only
100%

Abyssion, the Forgotten One (Released) is the Expert Mode exclusive final phase of the encounter. The transformation is notified with the status message, "Abyssion breaks free of its ancient prison!"

Behavior[edit | edit source]

  • While in this state, Abyssion will keep all of his previous attacks from his two previous forms without the need of lost life.
  • Additionally, Abyssion will move 50% faster and each attack will be infused with dark magic, dealing even more damage.

Aftermath[edit | edit source]

Upon defeating Abyssion for the first time, the Aquatic Depths biome's Choking Aura debuff will be replaced with the Untainted Waters buff, allowing them to breathe air in the biome without taking damage. This is indicated with the message upon its defeat "The toxic haze of the depths has been lifted..."

History[edit | edit source]

Characters: Enemies: Mud Man.png Pre-Hardmode • Glittering Golem.png Hardmode • Severed Legs.png Event • The Grand Thunder Bird.png Bosses
 • Diver.png Friendly NPCs • Pink Slime.png Familiars