How To Unlock the Secret Boss in Abyssus

Abyssus is a game full of secrets hidden beneath its surface, and the ultimate challenge for any Brinehunter is the elusive Secret Boss. This guide will walk you through the precise steps to unlock this hidden encounter and provide the essential strategies you need to defeat it.

Abyssus: How To Unlock the Secret Boss

Phase 1: How to Unlock the Secret Boss

Unlike a standard boss, the Secret Boss in Abyssus is not unlocked with a simple modifier. To gain access to this encounter, you must complete a multi-run quest involving three specific elite enemies.

Find the Secret Fountain: First, you need to locate the hidden fountain in your lobby. You can find this by going to the waterfall behind the dock and passing through it. You will find a room with a glowing symbol on the wall that you can interact with to reveal the fountain.

Defeat the Three Heralds: The main objective is to defeat three different elite mini-bosses (referred to by the community as Heralds or Guardians) that appear in the final biome of the game, The Royal Abyss. You will encounter one of these three on each run.

Witness the Statues Turn: Each time you successfully defeat one of the three different Heralds and return to the lobby fountain, a corresponding statue at the fountain will turn around and begin to spray water.

Unlock the Boss: Once all three statues have been activated, the "Deity Fish," or Secret Boss, will become available for you to challenge in the final room of the Royal Abyss.

This process may take multiple runs, as the specific Herald you encounter each time is random.

Phase 2: How to Defeat the Secret Boss

The Secret Boss is a massive DPS check and a test of your build. Here are the core mechanics and strategies you should know before you enterthe fight.

Core Mechanics

• Invulnerability Phases: The boss will frequently dive into the water, becoming completelyimmune to all damage. Do not waste your abilities or ammo during thisphase.
• Vulnerability Window: After a charge-up,the boss will emerge from the water. This is your only window to dealdamage. You have only a few seconds before it becomes invulnerableagain.
• The Final DPS Check: When the boss's health drops to its last quarter, a tough final phase begins. The boss willunleash an enraged attack that will kill you instantly if you do notdefeat it quickly enough. This is a pure damage-per-second race against a timer.

Recommended Strategies

• Save Your Cooldowns: Reserve all of your high-damage abilities and secondary fire charges for the short vulnerability windows.
• The Final Push: For the last 25% of the boss's health, unleash every single ability and attack you have. This is the DPS check, and you must defeat the boss before the wipe mechanic triggers.
• Turrets are Key: Before the boss emerges from the water, deploy any turrets orsummonable companions you have. This allows them to start dealing damage immediately when the boss becomes vulnerable, maximizing your damageoutput.
• Weapon and Build Recommendations: While many builds can get you to the final boss, a few have proven to be the most effective for this fight.
  • Combat Bow + Turrets: The Combat Bow can be upgraded to fire full-auto with guaranteed crits, and when paired with a turret that has the Barrier aspect, it creates a powerful and safe build.
  • Plasma Launcher: This weapon scales incredibly well with upgrades that give it bounceand area-of-effect (AoE) damage. It can deal immense damage to theboss's large hitbox.
  • Elemental Damage: Stacking status effects like Fire, Frost, or Shadow can be incredibly effective. The "Shadow" aspect, in particular, can be a game-changer as it makes a target take more damage from all sources.

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