Lost eternity
by Syf1xx
Lost Eternity is a Forge and NeoForge world generation mod for Minecraft 1.20.1 that adds surface buildings and underground dungeons with traps, enemies and loot.
What it does
The mod places unique surface buildings and dangerous underground dungeons into the world. Its dungeons are built around traps and enemies, and they reward players with better loot. Lost Eternity aims to make survival more challenging, with trap-heavy dungeons and encounters that reward tactical combat as well as passive exploration.
The structures generate naturally and can be found with the standard locate structure command. Each one has its own layout: a snowy surface landmark hides a deep frozen basement, a woodland shack sits over a large secret bunker complex, and a savannah dungeon forms a giant underground maze packed with zombie spawners. The mod works on client and server, so the server and every player need it. Builds are published for Forge and NeoForge, for 1.20.1 only.
Key features
Surface buildings
Unique buildings appear on the surface, each hinting at the dungeon hidden beneath it.
Trapped dungeons
Underground dungeons use pressure-plate traps and enemies, including ice skeletons in the frozen sections.
Naturally generated structures
Structures appear in newly generated terrain and can be located with the standard locate structure command.
Mid-to-late game gear testing
The savannah maze's zombie spawners give players a way to test their gear against sustained fights.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Exploration
Players who explore the world can follow surface landmarks down into the hidden structures.
Combat encounters
Trap rooms and spawner-filled mazes call for planning rather than straight fighting.
Who it’s for: Players who want more dangerous structures during survival, and server owners who want custom dungeons that generate on their world.
How it compares
NakronaStructure is a Forge mod for 1.20.1 that is client and server and under the MIT License, but it is not open source. Magical Relics is open source under the MIT License, with Forge files for 1.19.2 – 1.20.1, and is also client and server. Cursed Relics Dungeons is client and server for 1.20.1 – 1.21.8 on Forge and NeoForge, and is under All rights reserved.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Lost eternity | Forge and NeoForge | 1.20.1 | Client and server | 2026-05-26 |
| NakronaStructure | Forge | 1.20.1 | Client and server | 2024-08-26 |
| Magical Relics | Forge | 1.19.2 – 1.20.1 | Client and server | 2026-07-29 |
| Cursed Relics Dungeons | Forge and NeoForge | 1.20.1 – 1.21.8 | Client and server | 2026-07-27 |
Questions
Which loaders does Lost Eternity support?
Does the server need Lost Eternity?
Can the structures be found with a command?
In the catalog
Lost eternity is one of 8,515 World generation mods on ModsFinder, and one of 5,058 World generation mods for Forge. 34,764 mods support Minecraft 1.20.1.
More from Syf1xx
Similar mods
What the author says
Lost Eternity upgrades Minecraft's survival experience with challenging, trap-heavy dungeons designed to turn passive exploration into tactical combat encounters. The Ice Camp: A snowy surface landmark hiding a deep, frozen basement layout. Features pressure-plate traps and ice skeletons.
Official listing
- Modrinth page
- modrinth.com/mod/lost-eternity
- Owner
- Syf1xx
- Published
- 2026-05-26
- Updated on Modrinth
- 2026-05-26
- Facts verified
- 2026-10-15