How to Fix a Prominence II: Classic Mode Server That Keeps Crashing
Prominence II RPG: Classic Mode is the streamlined companion to Prominence II: Hasturian Era on NeoForge 1.20.1 — the same RPG world and combat system, but without the Hasturian Era's deeper lore campaign, harder endgame, and larger mod list. Its crash causes are a shorter, lighter version of the same patterns.
See the Prominence II: Classic Mode pack page for the full RAM and setup breakdown before you chase anything else.
1. Server won't boot: check the Java version first
NeoForge on Minecraft 1.20.1 requires Java 17. A server defaulted to an older Java runtime will fail consistently at startup, before the world ever loads — confirm this before looking at anything else.
- Confirm the server is launching under Java 17, not an older runtime
- A consistent, immediate failure with no players online points here first
2. Tick spikes during boss encounters
Classic Mode keeps the same RPG combat system and boss fights as the full Hasturian Era campaign, just in a shorter overall arc. Boss encounters concentrate a lot of entity AI, ability effects, and particle activity into a short window — a real tick-cost spike specific to fights, not a sign of a broken install.
If TPS is healthy right up until a boss fight starts and only dips during it, that's expected. If TPS was already sagging beforehand, the fight is just exposing a problem that was already there.
3. Config corruption or a bad mod update after a pack upgrade
If the server ran fine and only started crashing after updating the modpack version or hand-editing a config, treat that update as the first suspect rather than reopening the Java or RAM questions above.
4. RAM under the pack's realistic floor
The real floor for Prominence II: Classic Mode is 8 GB. Below that, boss-fight tick spikes from section 2 hit much harder because there's no memory headroom to absorb them — expect cascading lag rather than one clean crash.
FAQ
Is this the same as the Prominence II Hasturian Era crash-fix guide?+
No — this is Classic Mode, the streamlined companion pack. Same RPG world and combat system as Prominence II: Hasturian Era, but without the deeper lore campaign and harder endgame, with fewer mods overall. If you're running the full Hasturian Era pack instead, its RAM floor and crash causes differ slightly.
Why does my server fail to boot?+
Prominence II: Classic Mode runs on NeoForge for Minecraft 1.20.1, which requires Java 17. A server set up with an older Java runtime will fail at startup before any world loads.
How much RAM does Classic Mode actually need?+
The real floor is 8 GB. It's lighter than the full Hasturian Era campaign, but still an RPG pack with its own combat system and boss encounters, and should be sized accordingly rather than assumed to need less because it's the 'simpler' entry.
Host Prominence II: Classic Mode on hardware sized for its real floor
Classic Mode needs a real 8 GB floor to absorb boss-fight tick spikes without tipping into a watchdog kill, and taking a backup before any risky change keeps a bad edit from costing a run.
View Minecraft Hosting →