ModsFinder

Simulation Breach

by rhelwig

Simulation Breach turns ordinary mobs into hostile Agents once a world begins to breach its simulation, as players are hunted in the open world.

FabricClient and serverCreative Commons Attribution 4.026.1.2

What it does

Ordinary mobs can be converted into Agents that are assigned to the simulation and pursue players, and each Agent can recruit more. The conversion is not instant: a marked mob shakes and plays a custom transformation sound before the Agent appears, and it can still be killed before the change finishes. Hostile Agents prioritize players and will make short detours to convert nearby mobs, so an outbreak spreads when it is ignored.

Natural outbreaks are rare and tied to player activity. They appear close to players, are bounded by local caps and scale with difficulty. Staying in one area gradually raises the local outbreak pressure, and the natural outbreak system sends alerts when one begins. Simulation Breach is written for survival play, where the calm world it begins with slowly fails, and it stores its breach data persistently. Files are published for Fabric only, for Minecraft 26.1.2, and the mod runs on client and server.

Key features

  1. Agent conversions

    Ordinary mobs are converted into hostile Agents that pursue players and recruit more Agents nearby.

  2. Delayed transformations

    Transformations take time, can be interrupted by killing the marked mob, and play a custom sound.

  3. Configurable spread

    The rate at which outbreaks spread is configurable and scales with difficulty, along with XP rewards.

  4. Natural outbreak alerts

    Rare outbreaks near players are announced by alerts, with local caps keeping them bounded.

Compatibility

Latest build for each game version and loader.

26.1.21.0.1
ReleaseBetaAlphaNot available

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

Questions

Does Simulation Breach need Fabric API?

No required dependency is listed for Fabric.

Does Simulation Breach have to be installed on the server?

Yes. Servers that run it need every player to install it too.

Can the outbreak system be tested without waiting for a natural one?

Yes. The mod includes an operator debug command for testing transformations, and the author notes list it in version 1.0.1.

In the catalog

Simulation Breach is one of 11,058 Mobs mods on ModsFinder, and one of 5,189 Mobs mods for Fabric. 15,189 mods support Minecraft 26.1.2.

Mobs mods11,058Fabric modsMods for 26.1.215,189

More from rhelwig

All projects
Live Villages26.1.1 – 26.1.2Flame, Fuel, Farm, and Forge1.21.10 – 1.21.11

Similar mods

[EMF] Entity Model Features1.18.2 – 26.3Animal Feeding Trough1.16.5 – 26.3Just Enough Breeding (JEBr)1.15.2 – 26.3TslatEntityStatus1.16.5 – 26.3Spawn Animations1.16 – 26.3Guard Villagers (Fabric/Quilt)1.18.2 – 26.2

What the author says

Simulation Breach turns survival into a quiet systems failure. Ordinary mobs can become Agents, hostile entities assigned by the simulation to correct the player-shaped breach. Agents pursue players, make short detours to convert nearby mobs, and can escalate a calm world into a spreading outbreak if ignored…
rhelwig, on the Modrinth page

Official listing

Owner
rhelwig
Published
2026-04-19
Updated on Modrinth
2026-05-09
Facts verified
2026-10-15

Tags

Mobs
Open on ModrinthCompare