seedlookoutAncient-debris finder
Enter a Java 26.3 seed and your Nether coordinates to find predicted places to search for ancient debris.
Placement predictions · Java 26.3 only · In-game accuracy checks pending
What the targets mean
The finder follows the seeded origins of the two ancient-debris placement features in each chunk. One feature places its origin between Y 8 and 24; the other uses Y 8 through 119.
A target is a placement origin. Ancient debris can scatter nearby, and the origin itself can contain no debris. Terrain, replacement blocks, air exposure and later features have not been reconciled. These predictions have not been checked in game.
Use Nether coordinates
Enter X and Z from the Nether. The finder does not convert Overworld coordinates. Choose the version that generated those chunks: upgrading an older world to 26.3 does not regenerate existing chunks. This model covers standard Java 26.3 generation; custom data packs and Bedrock are unsupported.
- Enter your seed and Nether X and Z coordinates.
- Choose a chunk radius and run the prediction.
- Copy a target’s X, Y and Z, then inspect the surrounding area in game.
For Overworld mining, open the diamond finder.