// modpack server guide

Supernova Empires 2 server hosting & setup guide

A Supernova Empires 2 server needs Java 8 and about 3–3.5 GB of RAM for up to 3 players.

A Totaly reformed modpack from the previous, based on ProjectE and with other mods

Summary from Supernova Empires 2 on Modrinth.

By DSN Servers · Updated October 2026 · Forge · Minecraft 1.12.2 · Java Edition

Supernova Empires 2 is a Forge modpack for Minecraft 1.12.2 with 77 mods, 76 of which run on the server. We'd pick our Standard plan (4 GB) for it.

Quick facts

Loader	Forge
Minecraft versions	1.12.2
Java needed	Java 8 for Minecraft 1.12.2 Java version chart.
Mods	76 run on the server77 in the pack. The other one is client-only, and the server skips it.
RAM	About 3–3.5 GB for 1–3 playersBy player count.
Downloads	160,008 on Modrinth
Last updated	July 3, 2023 (version 7.0.3)
First published	March 24, 2023 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, combat, magic, quests

Supernova Empires 2 server files

No. Supernova Empires 2 has no separate server pack on Modrinth or CurseForge (we checked CurseForge on October 5, 2026), so the server is built from the .mrpack: the Forge server for Minecraft 1.12.2, 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 a Supernova Empires 2 server need?

Players online	RAM	DSN plan
1–3 players	About 3–3.5 GB	Standard (4 GB)
4–8 players	About 3.5–4.5 GB	Premium (8 GB)Standard (4 GB) can do if players stay close.
9–15 players	About 4–6 GB	Premium (8 GB)Standard (4 GB) can do if players stay close.

Estimated from 76 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 1.12.2 takes it in the java command (-Xmx), usually in the start script. RAM guide.

Supernova Empires 2 server requirements

Java	Java 8
Loader	Forge for Minecraft 1.12.2
CPU	Fast single-core speed (one main thread).
RAM	About 3–6 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 Supernova Empires 2

Standard

4 GB RAM · planned launch price $16/month

At about 76 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.

Join the launch list Compare all plans

More than 3 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 Supernova Empires 2 server on your own PC

What's specific to Supernova Empires 2, step by step. The full walkthrough for any pack: how to make a modded Minecraft server.

Install Java 8.
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 -jar on the Forge jar the installer made, then set eula=true in eula.txt if 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 Supernova Empires 2 on DSN

Once we relaunch (join the launch list), on DSN you'd install Supernova Empires 2 from the panel's Modrinth modpack installer (version 7.0.3), pick Java 8 on the Startup tab and accept the EULA in the console. No port forwarding.

How to play Supernova Empires 2 with friends

Each player installs Supernova Empires 2 version 7.0.3 with the Modrinth App or Prism Launcher, the same version as the server, and adds the server's address under Multiplayer.

Different versions of Supernova Empires 2 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 Supernova Empires 2

Can't keep up! Is the server overloaded? means ticks take longer than 50 ms; more RAM won't fix that once Supernova Empires 2 has enough (tick lag guide). For Supernova Empires 2:

Distances: view-distance=8 in server.properties.
Pre-generate: with a pregeneration mod built for 1.12.2, before people explore.

Common Supernova Empires 2 crashes

What a Forge 1.12.2 server running Supernova Empires 2 hits most. For any other error, paste the log into the free crash log analyzer.

Wrong Java version. Forge for 1.12.2 won't start on anything newer than Java 8, and stops with ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader. Java version fix.
Out of memory. Supernova Empires 2 (76 mods on the server) needs about 3–3.5 GB for 1–3 players; java.lang.OutOfMemoryError means it ran out. Out-of-memory fix.
Client-only mod on the server. Supernova Empires 2 includes 1 client-only mod, which a server install skips; copying a player's mods folder brings it back and stops the server. 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 Supernova Empires 2 by hand usually crash it with a missing dependency: net.minecraftforge.fml.common.MissingModsException names the mod.
Ticking entity or block entity. The crash report names it and gives its coordinates. Ticking entity fix.

Updates and support

Before moving Supernova Empires 2 past version 7.0.3, back up the world: see updating a modpack server without losing your world.

Bugs in Supernova Empires 2 itself go to its authors: issue tracker and wiki. Server problems on DSN: hello@dsnservers.com or Discord.

More: all modpack guides and how to make a modded server.

Run Supernova Empires 2 on DSN when we relaunch.

Our pick, Standard: 4 GB, planned at $16/month.

Join the launch list

DSN Servers isn't affiliated with Supernova Empires 2 or Modrinth. The pack's name, icon, summary and stats come from Modrinth's public API (checked October 4, 2026).