How to Fix a Dungeon Heroes Server That Keeps Crashing

1. Check if the crash lines up with an encounter starting

The first thing to check is timing. If the server freezes or the TPS drops hard right as a dungeon encounter triggers — not randomly during normal exploration — the encounter's mob-count scaling is the most likely cause. These systems size the encounter to however many players the game thinks are in your party, and if that count is wrong, you get more mobs spawning simultaneously than the server tick can absorb.

• Note how many players were actually present vs. how many the encounter seemed to spawn for
• Check whether anyone disconnected or reconnected in the minute before the crash

2. A player disconnecting mid-encounter is a known trigger

Party-size detection for scaling encounters is typically computed at a specific moment — usually when the encounter starts or re-evaluates. If a player drops out right at that moment, the server can end up spawning mobs for a party size that no longer matches who's actually online, pushing the mob count higher than the remaining players (and the server) can handle.

If your crashes cluster around moments where someone's connection was flaky, this is worth testing directly: have a stable group of players run the same encounter type without anyone disconnecting, and see if the lag spike reproduces.

3. Rule out a single conflicting mod before assuming it's systemic

Because Dungeon Heroes is a vanilla+ pack rather than a large kitchen-sink modpack, it doesn't carry the sheer mod-count overload risk that heavier tech or exploration packs do. That actually makes isolating the cause easier: check your latest crash log for a single mod's stack trace at the top. If one specific mod keeps appearing, that's a stronger lead than a general performance theory.

If you've added any extra mods on top of the base pack, try removing them first — third-party additions are a more common source of crashes in lighter packs like this than the base pack's own code.

4. Check for corrupted dungeon/structure data after a bad shutdown

Structured dungeon encounters generate and track state as players explore. If the server was killed uncleanly during an earlier crash (rather than stopped properly), that in-progress structure or encounter state can end up corrupted, causing the same area to crash again every time a player re-enters it. If the crash is reproducible at one specific dungeon location but not elsewhere, this is worth suspecting — and it's a good reason to keep recent backups so you can roll back to before the corruption rather than losing the world.

5. RAM under the pack's realistic floor

5 GB is the real floor for Dungeon Heroes (RPG Series), based on how the pack actually behaves under group play rather than a generic guess. Under-provisioning rarely shows up as an instant, clean crash — what you'll see first is rising GC pause times and gradually worsening TPS as more players explore different areas simultaneously, which then cascades into a tick timeout once the server falls far enough behind. If your crashes feel more like a slow decline before the drop than a sudden one-off, check your memory allocation against this floor before digging further into mod conflicts.