// modpack server guide
Elysium Days server hosting & setup guide
An Elysium Days server needs Java 17 and about 9–10.5 GB of RAM for up to 8 players.
A modpack that makes Minecraft how it should have been all along, so you can enjoy it again.
Summary from Elysium Days on Modrinth.
Elysium Days is a Fabric modpack for Minecraft 1.20.1 with 417 mods. We'd pick our Heavy plan (12 GB) for it.
Quick facts
| Loader | Fabric |
|---|---|
| Minecraft versions | 1.20.1 |
| Java needed | Java 17 for Minecraft 1.20.1 Java version chart. |
| Mods | 417 modsCounted from the pack's file list on Modrinth. None are marked client-only. |
| RAM | About 7.5–8.5 GB for 1–3 playersBy player count. |
| Downloads | 404,360 on Modrinth |
| Last updated | June 25, 2026 (version 8.0.0) |
| First published | March 9, 2024 on Modrinth |
| Server support | Required: the pack has mods that must run on the server. |
| Server pack | Not published separatelyHow to build the server. |
| Modrinth tags | adventure, optimization, combat, lightweight, magic, quests |
Elysium Days server files
No. Elysium Days has no separate server pack on Modrinth, so the server is built from the .mrpack: the Fabric server for Minecraft 1.20.1, plus the pack's overrides folder and the server-side mods its modrinth.index.json lists. A modpack installer does this for you; our guide shows how to make a server for a modpack with no server pack.
How much RAM does an Elysium Days server need?
| Players online | RAM | DSN plan |
|---|---|---|
| 1–3 players | About 7.5–8.5 GB | Heavy (12 GB)Premium (8 GB) can do if players stay close. |
| 4–8 players | About 9–10.5 GB | Heavy (12 GB) |
| 9–15 players | About 10–13.5 GB | Heavy (12 GB) if players stay closeMore than 12 GB if they spread out. |
Estimated from 417 mods on the server with our RAM calculator, not measured: low end if players stay together, high end if they spread out.
With 9–15 players spread across the map, Elysium Days can need more than 12 GB, our biggest plan. A lower view distance and a pre-generated world help it fit; past that, a host with bigger plans is the better choice.
Set Java's heap (-Xmx) 10–15% under the RAM you have, about -Xmx10500M on 12 GB. Fabric 1.20.1 takes it in the java command (-Xmx), usually in the start script. RAM guide.
Elysium Days server requirements
| Java | Java 17 |
|---|---|
| Loader | Fabric for Minecraft 1.20.1 |
| CPU | Fast single-core speed (one main thread). With 417 mods, the first start takes minutes. |
| RAM | About 7.5–13.5 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 Elysium Days
Heavy
12 GB RAM · planned launch price $42/month
At about 417 Fabric mods this is a heavy pack, and 12 GB keeps it clear of out-of-memory crashes.
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 Heavy servers open.
Heavy is our biggest plan. 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 an Elysium Days server on your own PC
What's specific to Elysium Days, 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.
Build them from the .mrpack, as in server files above.
- Start it and accept the EULA.
Run the start script in the server files, or
java -jaron the Fabric 1.20.1 server launcher, then seteula=trueineula.txtif you accept Mojang's EULA (EULA step). With 417 mods, the first start takes minutes. - 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 Elysium Days on DSN
Once we relaunch (join the launch list), on DSN you'd install Elysium Days from the panel's Modrinth modpack installer (version 8.0.0), pick Java 17 on the Startup tab and accept the EULA in the console. No port forwarding.
How to play Elysium Days with friends
Each player installs Elysium Days version 8.0.0 with the Modrinth App or Prism Launcher, the same version as the server, and adds the server's address under Multiplayer.
Different versions of Elysium Days 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 Elysium Days
Can't keep up! Is the server overloaded? means ticks take longer than 50 ms; more RAM won't fix that once Elysium Days has enough (tick lag guide). For Elysium Days:
- Measure first: spark's
/spark tpsand profiler work on 1.20.1 and name the mod or machine using the tick time. - Distances:
view-distance=8and a lowersimulation-distanceinserver.properties. - Pre-generate: Chunky for 1.20.1,
/chunky radius 3000then/chunky start, before people explore. - Chunk loaders keep machines running with nobody nearby; in a pack this size, dozens add up.
Common Elysium Days crashes
What a Fabric 1.20.1 server running Elysium Days hits most. For any other error, paste the log into the free crash log analyzer.
- Out of memory. Elysium Days (417 mods on the server) needs about 7.5–8.5 GB for 1–3 players;
java.lang.OutOfMemoryErrormeans it ran out. Out-of-memory fix. - Wrong Java version. Elysium Days on Minecraft 1.20.1 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. - Client-only mod on the server. The Elysium Days 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 Elysium Days 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 Elysium Days past version 8.0.0, back up the world: see updating a modpack server without losing your world.
Bugs in Elysium Days itself go to its authors: issue tracker, wiki and Discord. Server problems on DSN: hello@dsnservers.com or Discord.
Packs like Elysium Days
More: all modpack guides and how to make a modded server.
Run Elysium Days on DSN when we relaunch.
Our pick, Heavy: 12 GB, planned at $42/month.
DSN Servers isn't affiliated with Elysium Days or Modrinth. The pack's name, icon, summary and stats come from Modrinth's public API (checked October 4, 2026).