// modpack server guide
One block horror server hosting & setup guide
A One block horror server needs Java 17 and about 3–4 GB of RAM for up to 8 players.
It's regular one block survival, but with many dwellers to give you a chilling experience (optimized)
Summary from One block horror on Modrinth.
One block horror is a Forge modpack for Minecraft 1.19.2 with 52 mods. We'd pick our Standard plan (4 GB) for it.
Quick facts
| Loader | Forge |
|---|---|
| Minecraft versions | 1.19.2 |
| Java needed | Java 17 for Minecraft 1.19.2 Java version chart. |
| Mods | 52 modsCounted from the pack's file list on Modrinth. None are marked client-only. |
| RAM | About 2.5–3 GB for 1–3 playersBy player count. |
| Downloads | 483,153 on Modrinth |
| Last updated | July 19, 2026 (version 1.0.3) |
| First published | July 6, 2025 on Modrinth |
| Server support | Required: the pack has mods that must run on the server. |
| Server pack | One_block_horror_server_files_1.8.4.zipOfficial server pack on CurseForge, for One block horror-1.8.4.zip. Checked October 5, 2026. |
| Modrinth tags | adventure, challenging, combat |
One block horror server files
Yes, on CurseForge. Modrinth has no separate server pack for One block horror, but the authors publish one on CurseForge: One_block_horror_server_files_1.8.4.zip, for One block horror-1.8.4.zip (September 16, 2026).
That's not the version Modrinth has (1.0.3). A server and its players must run the same pack version, so either install the client pack from CurseForge too, or build the server from the Modrinth pack instead. CurseForge lists it as an extra file rather than as that version's server pack, so installers that look for CurseForge's server pack won't find it: download it by hand.
How much RAM does a One block horror server need?
| Players online | RAM | DSN plan |
|---|---|---|
| 1–3 players | About 2.5–3 GB | Standard (4 GB) |
| 4–8 players | About 3–4 GB | Standard (4 GB) |
| 9–15 players | About 3.5–5 GB | Premium (8 GB)Standard (4 GB) can do if players stay close. |
Estimated from 52 mods on the server with our RAM calculator, not measured: low end if players stay together, high end if they spread out.
Set Java's heap (-Xmx) 10–15% under the RAM you have, about -Xmx3500M on 4 GB. Forge 1.19.2 reads it from user_jvm_args.txt: uncomment the -Xmx line. RAM guide.
One block horror server requirements
| Java | Java 17 |
|---|---|
| Loader | Forge for Minecraft 1.19.2 |
| CPU | Fast single-core speed (one main thread). |
| RAM | About 2.5–5 GB for 1–15 players (table above) |
| Disk | The server files, a growing world and backups |
| Network | TCP port 25565 open to players |
Recommended plan
Our pick for One block horror
Standard
4 GB RAM · planned launch price $16/month
At about 52 Forge mods this is a light pack, so 4 GB of RAM covers it for a small group.
Ordering is closed until we relaunch. We aren't taking orders or payments while we move to new hardware. Join the launch list and we'll email you when Standard servers open.
More than 8 players, or lots exploring at once? Go up to Premium (8 GB). Not sure? Email hello@dsnservers.com.
Planned launch price in USD, billed monthly once ordering opens, with a 7-day refund window.
How to make a One block horror server on your own PC
What's specific to One block horror, step by step. The full walkthrough for any pack: how to make a modded Minecraft server.
- Install Java 17.
Check with
java -version. Java version chart. - Get the server files.
Download the official server pack,
One_block_horror_server_files_1.8.4.zip, from CurseForge and unzip it into an empty folder. Make sure your players install the same pack version. - Start it and accept the EULA.
Run the start script in the server files, or the
run.sh/run.batthe Forge 1.19.2 installer writes, then seteula=trueineula.txtif you accept Mojang's EULA (EULA step). - Set the RAM with
-Xmx, sized from the table above. - Let friends connect: forward TCP 25565, or use a tunnel or host behind CGNAT (can't connect?).
Or run One block horror on DSN
Once we relaunch (join the launch list), on DSN you'd install One block horror from the panel's Modrinth modpack installer (version 1.0.3), pick Java 17 on the Startup tab and accept the EULA in the console. No port forwarding.
How to play One block horror with friends
Each player installs One block horror version 1.0.3 with the Modrinth App or Prism Launcher, the same version as the server, and adds the server's address under Multiplayer.
Different versions of One block horror on the server and a client show up as Mismatched mod channel list or mod rejections. Why friends can't join, timeouts included.
Lag and performance on One block horror
Can't keep up! Is the server overloaded? means ticks take longer than 50 ms; more RAM won't fix that once One block horror has enough (tick lag guide). For One block horror:
- Measure first: spark's
/spark tpsand profiler work on 1.19.2 and name the mod or machine using the tick time. - Distances:
view-distance=8and a lowersimulation-distanceinserver.properties. - Pre-generate: Chunky for 1.19.2,
/chunky radius 3000then/chunky start, before people explore.
Common One block horror crashes
What a Forge 1.19.2 server running One block horror hits most. For any other error, paste the log into the free crash log analyzer.
- Wrong Java version. One block horror on Minecraft 1.19.2 needs Java 17. Started on Java 8, it stops with
UnsupportedClassVersionError: ... class file version 61.0, this version of the Java Runtime only recognizes class file versions up to 52.0. Java version fix. - Out of memory. One block horror (52 mods on the server) needs about 2.5–3 GB for 1–3 players;
java.lang.OutOfMemoryErrormeans it ran out. Out-of-memory fix. - Client-only mod on the server. The One block horror pack file marks none of its mods client-only, so this usually means one was copied over from a player's mods folder. Check a mods list with the client-or-server-side checker. Client-only mod fix.
- After adding or updating a mod. Mods you add to One block horror by hand usually crash it with a missing dependency or a mixin conflict.
- Ticking entity or block entity. The crash report names it and gives its coordinates. Ticking entity fix.
Updates and support
Before moving One block horror past version 1.0.3, back up the world: see updating a modpack server without losing your world.
Bugs in One block horror itself go to its authors: Discord. Server problems on DSN: hello@dsnservers.com or Discord.
Packs like One block horror
More: all modpack guides and how to make a modded server.
Run One block horror on DSN when we relaunch.
Our pick, Standard: 4 GB, planned at $16/month.
DSN Servers isn't affiliated with One block horror or Modrinth. The pack's name, icon, summary and stats come from Modrinth's public API (checked October 4, 2026).