Echo Protocol
by TheYeldo
Echo Protocol is a Fabric psychological horror mod in which echoes of past player movements slowly take the place of the player's own actions.
What it does
The mod records how a player moves and interacts, then creates echoes that replay those movements. Echoes spawn in places the player often visits, such as frequently visited rooms, doors and entrances, beds used for storage, workstations, portals and common movement routes. Each echo copies routes, held items, sprinting, sneaking and hand movements, and it can stop where the player previously stopped or repeat a familiar action. An echo starts as an accurate copy with a delay. Over time some echoes stay accurate while others become corrupted.
The mod is aimed at players who want a slow, unsettling horror experience rather than combat. Echoes that wander randomly and behave like ordinary hostile mobs are part of the same design, so some encounters look like traditional monsters before the replay logic takes over. Longer play makes the echoes harder to tell apart from real memories.
Key features
Behavior replay
Echoes reproduce direction, pose, held items, sprinting, sneaking and hand movements from earlier play.
Memory-based spawns
Echoes appear in rooms, at doors, beside beds and workstations, and along common movement routes.
Gradual corruption
An echo starts accurate, then drifts into wrong routes, different items and independent hostile behavior.
Edge-of-vision sightings
Echoes appear briefly at the edge of vision, and vanish when looked at directly or approached unobserved.
Replayed sounds
Sounds tied to earlier doors, containers, workstations, items and other interactions are played back by echoes.
Gallery
Compatibility
Latest build for each game version and loader.
1.21.x11 of 11 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
The Archivist is a Fabric mod for 1.21 – 1.21.11, client and server, under All rights reserved and not open source. SEAM and The Other Side are Fabric mods with the same client and server environment and license, both not open source. Horror messages is a server-required, client-optional mod for Fabric, Forge and NeoForge across 1.19.2 – 1.21.8, not open source. Echo Eye is open source under the MIT License for Fabric and NeoForge, 1.21 – 1.21.1, and runs on client and server.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Echo Protocol | Fabric | 1.21.1 – 1.21.11 | Client and server | 2026-09-19 |
| The Archivist | Fabric | 1.21 – 1.21.11 | Client and server | 2026-09-21 |
| SEAM | Fabric | 1.20.1 – 1.20.6 | Client and server | 2026-05-13 |
| The Other Side | Fabric | 1.20.1 – 1.20.6 | Client and server | 2026-06-23 |
| Horror messages | Fabric, Forge and NeoForge | 1.19.2 – 1.21.8 | Server required, client optional | 2025-07-24 |
| Echo Eye | Fabric and NeoForge | 1.21 – 1.21.1 | Client and server | 2025-07-05 |
Questions
Does Echo Protocol need to be installed on the server?
Which loader does Echo Protocol use?
Which game versions does Echo Protocol support?
In the catalog
Echo Protocol is one of 7,555 Cursed mods on ModsFinder, and one of 4,235 Cursed mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from TheYeldo
Similar mods
What the author says
Echo Protocol is a psychological horror mod for Minecraft Java Edition. It quietly remembers fragments of your movement, familiar places, habits, sounds, and interactions. Later, those memories return as translucent figures known as Echoes.
Official listing
- Modrinth page
- modrinth.com/mod/echo-protocol
- Owner
- TheYeldo
- Published
- 2026-07-14
- Updated on Modrinth
- 2026-09-19
- Facts verified
- 2026-10-15