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library.jar

by postica

Under library.jar, the world changes slowly the longer a player keeps playing, in a Forge horror mod built on dread and paranoia.

ForgeClient and serverAll rights reserved1.20.1 – 1.20.6

What it does

Once a presence starts writing a story, it does not let go. The mod builds unease gradually instead of relying on loud jumpscares, and it moves from subtle anomalies in the first phases to direct pursuit later. A seven-phase escalation system sets the pace, with the early phases mostly setting up ambience and lore, and the later phases making pressure mechanics dominant.

Custom horror entities and scripted encounters apply pressure through timing and atmosphere, with ominous audio and narrative interruptions that raise the threat. An optional voice-reactive behavior lets certain spoken lines get in-character answers. Some of those voice lines are synthesized through an external online endpoint, which needs an internet connection and receives only the text of each line. If the runtime components for voice features are missing, those features are disabled while the core gameplay stays playable.

library.jar is for Forge only, across six release versions, 1.20.1 – 1.20.6. Servers that run it need every player to install it too. The mod works in singleplayer and in multiplayer or LAN, and it is released under All rights reserved and is not open source.

Key features

  1. Seven-phase escalation

    Anomalies start subtle and move through seven phases to direct pursuit, with concrete behavior changes at each step.

  2. Custom horror entities

    Scripted entities and encounters build pressure through timing, with personalized narrative lines tied to a Librarian and Shadow Stalker loop.

  3. Atmosphere-first presentation

    Ominous audio and narrative interruptions carry escalating threat signals, and the early phases favor ambience over shocks.

  4. Optional voice reactions

    Certain spoken lines receive in-character responses when the voice-reactive feature is available.

Compatibility

Latest build for each game version and loader.

1.20.606
1.20.506
1.20.406
1.20.306
1.20.206
1.20.106
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

How it compares

Full comparison

Horror sounds is a Forge mod for 1.20.1 under the MIT License, and it runs on client and server. Unknown Host is also Forge for 1.20.1 and runs on client and server, but it is released under All rights reserved and is not open source. WITD is Forge for 1.20.1 under the Creative Commons Attribution Non Commercial 4.0 license and is not open source.

ModLoadersGame versionsEnvironmentUpdated
library.jarForge1.20.1 – 1.20.6Client and server2026-03-03
Horror soundsForge1.20.1Client and server2026-03-17
Unknown HostForge1.20.1Client and server2026-10-01
WITDForge1.20.1Client and server2025-03-09

Questions

Does library.jar need to be installed on the server?

Yes. Installation covers the server and each player's game.

Does library.jar require internet access?

Only for the voice features that use the external online endpoint. The endpoint receives the line text needed for synthesis, and the core gameplay remains playable without it.

Which Forge versions does library.jar support?

Files are published for Forge on 1.20.1 – 1.20.6, with 06 for 1.20.6 as the latest file, released 2026-03-03.

In the catalog

library.jar is one of 7,555 Cursed mods on ModsFinder, and one of 3,426 Cursed mods for Forge. 11,154 mods support Minecraft 1.20.6.

Similar mods

What the author says

A story-driven psychological horror mod for Forge 1.20.1 focused on dread, paranoia, and slow escalation rather than constant loud jumpscares. Most horror mods rely on frequent loud stingers and instant shocks. This one does not.
postica, on the Modrinth page

Official listing

Owner
postica
Published
2026-02-24
Updated on Modrinth
2026-03-03
Facts verified
2026-10-15

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