Once Human Isles of Abyss — Release & Preparation Guide
Public release window: October 2026; exact date TBA in the verified material. Final Test: September 16–October 8, 2026 (PT), with the test content explicitly still under development.
Maritime survival
Scattered islands, ocean and underwater exploration, dynamic weather/day-night systems, building and naval encounters.
Server-wide progression
Calamity Towers contribute to World Progress, with first-clear significance described in official test material.
The Sunken Lord
Current Final Test material presents The Sunken Lord as a four-player Dungeon—an example of why pre-release numbers should be labeled as test-state facts.
Confirmed Final Test systems
| System | What we know |
|---|---|
| Voyagers | Randomized ship encounters |
| Haywire Zones | Four types described in test material |
| Calamity Nests | Randomized encounters |
| Naval combat | Improved cannon controls and projectile-drop pre-aiming |
| Underwater exploration | Treasure Map-driven underwater sites |
| Wild Deviations | Capture is part of the scenario experience |
| Night | More dangerous enemies after dark |
What to do before Isles
Confirmed vs final
Everything labeled Final Test should remain visibly marked as pre-release information. Official test notes explicitly say the scenario remains under development; phase timing, balance and individual mechanics may still change before the public launch.