How to Unlock Plasma Launcher in Abyssus

By Ambar Jimenez | 2025-08-24 11:19:39
In the roguelite world of Abyssus, the Plasma Launcher is a powerful weapon known for its explosive damage and ability to clear enemies quickly. It's a high-risk, high-reward weapon that's particularly effective in tough boss fights and against large groups of enemies.Here's how to unlock the Plasma Launcher and how to use it effectively.

The Plasma Launcher

The Plasma Launcher is an explosive weapon that excels at area-of-effect (AoE) damage. It fires plasma projectiles that detonate on impact, making it ideal for taking on multiple enemies at once. While incredibly powerful, its main drawback is a high ammo consumption rate.The weapon shines in situations where you need to deliver massive damage in a short amount of time, such as during Elite Battles or against bosses with large health pools. To maximize its effectiveness, you should pair it with Charms or Blessings that boost explosive power, fire rate, or critical damage.

How to Unlock the Plasma Launcher

Unlocking the Plasma Launcher requires you to complete a specific challenge and meet a few conditions during your run.

  • Complete the "Blazing Weapon" Challenge: This is the first requirement to make the Plasma Launcher available.
  • Speed Run: You must complete your expedition and reach Act 4, Stage 1 in under 35 minutes.
  • Find the Hidden Room: Once you are in Act 4, Stage 1, do not proceed to the main boss fight. Instead, look for a hidden room.

    • Navigate to the final stage with the red, white, and black theme.
    • Walk up the main staircase. You'll pass a room with a timed treasure chestand a health podium (if you've unlocked those upgrades).
    • Go up the next set of stairs.
    • Instead of heading left into the large red/black/white area, look to yourright. A door that was previously locked will now be open.
    • Inside this room, you will find the Plasma Launcher.

The key to unlocking the weapon is not just completing the run, but doingit quickly. You need to focus on moving through each stage efficientlywhile gathering strong upgrades.

Using the Plasma Launcher Effectively

To get the most out of the Plasma Launcher, you should focus on a build that supports its explosive nature.

  • Focus on High-Burst Damage: The launcher is designed for big hits. Look for Blessings that provideinstant damage boosts and stack them to increase your output.
  • Manage Your Ammo: Since the Plasma Launcher uses ammo quickly, you'll need to be mindfulof your shots. Use it for high-priority targets and save your otherweapons for smaller enemies.
  • Synergize with Mods and Charms: Look for upgrades that increase your ammo capacity, fire rate, orexplosive damage. This will allow you to stay in the fight longer anddeal even more damage.
  • The Tesla Coil Trick: To get an edge on the timed challenge, consider using the Tesla Coilweapon. Its auto-aim mod creates multiple beams that can triple yourclose-range damage, making it perfect for quickly taking down bosses and elites to save time.
Platform(s): Microsoft Windows PC
Genre(s): Action, Adventure, Indie
Developer(s): DoubleMoose Games
Publisher(s): The Arcade Crew
Mode: Single-player, multiplayer
Video preview



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