I.R.I.S. Leviathan (HORDE MODE)
🟡 Updated this year⚠️ Install Order · 2 steps
Install in this order, then this mod last — most mods fail to load without their framework and dependencies in place.
Preview

🔍 Analysis
- 👍 0.8% endorsement rate
- ✅ Updated 309 days after the latest game patch — actively maintained
- 🏆 #9 of 16 Creatures mods in this game by downloads
📋 About This Mod
I. R. I. S. — Integrated Reconnaissance & Interdiction System
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Current Update:
I added Save-Spots where IRIS cant spawn and you can play normally. You need to copy the one Structure file into the Epic Structure Loader / Structures.
- Complete Safe Shallows
- Gun Island underground
- Lava Zone where the cure and the Story Ending is
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Epilepsie warning for the mod because of flickering lights
"NO AI used. Real recordings, multiple filters. If this seems ‘too unbelievable and exceptional’ to be made by a human, that says more about your own limitations than mine." You will say "No, it sounds only bad", but we know this is not the real reason behind it, no matter what you say. Even if you see the AI tag, some users are jealous and tag it, but it dont change reality ;)
"Catalog No.: AL-3941-L — Classification: Leviathan-Class / Autonomous Construct Entity" "The construct does not exhibit predatory behavior. Detected objects are not engaged — they are removed. The distinction is not semantic."━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Although artificial, I. R. I. S. qualifies as a Leviathan-Class entity according to Subnautica lore. The "Leviathan" designation is based primarily on size and threat level, not on biological origin.
With a 9-meter core diameter and significantly larger deployed structure, advanced predatory algorithms, and active pursuit of vehicles and players, I. R. I. S. meets the established criteria for Leviathan classification.━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
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I.R.I.S. Leviathan is a horde-mode creature mod for Subnautica that introduces a Leviathan-Class Drone with unique hunting behavior. Unlike other leviathans, she actively searches for the player and adapts her tactics based on player actions, such as whether they are in a Seamoth. This mod is for players seeking a more challenging and dynamic predator encounter.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Unique predator AI that actively hunts you—no more passive leviathans.
- Player choices matter: hiding in a Seamoth changes how she attacks.
- Tiny community (7 endorsements) but 824 downloads show real interest.
⚠️ Cons
- Very few endorsements (7) means limited community testing and feedback.
- Last updated August 2026—check compatibility with your game version.
For Subnautica veterans who want a real threat that forces you to think on your feet. If you're tired of leviathans that just swim in circles, this mod adds a predator that learns from your actions. Skip if you prefer a chill exploration experience.
💡 Beginner Tips
- Watch I.R.I.S.'s patrol patterns before engaging—she's smarter than the average leviathan.
- Experiment with different vehicles: the Seamoth changes her behavior, so try approaching on foot or in a Cyclops.
- Save before testing her behavior—you'll die a lot while learning her tells.
📊 Mod Details
- Game
- Subnautica Mods
- Author
- Pazvanti1985
- Version
- 2
- Downloads
- 824
- Endorsements
- 7
- Category
- Creatures
- Created
- 5/29/2026
- Updated
- 8/8/2026
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