How to Fix a The Adventure of Valkyriens Server That Keeps Crashing
The Adventure of Valkyriens is a Valkyrien Skies ship-combat pack on Forge 1.20.1, where players build and pilot flying warships using VS2 and its weapon and ship-system addons. Because it's built around a specialized physics engine rather than mainstream Forge content mods, it sees less community testing than typical modpacks, so crashes tend to cluster around specific causes: Java version mismatches, ship-physics tick load, and mod-specific edge cases. This guide walks through the most common ones in order.
See the The Adventure of Valkyriens pack page for the full RAM and setup breakdown before you chase anything else.
1. Check your Java version first
Forge 1.20.1 requires Java 17. If the server fails to boot at all — rather than running for a while and then crashing — a Java version mismatch is the first thing to rule out, since it's a universal requirement for any Forge pack on this Minecraft version. This is especially easy to miss if you're migrating from an older 1.12.2 or 1.16 pack that ran on Java 8, or if a host's default Java version wasn't updated when the pack was installed.
- Confirm the server is actually launching under Java 17, not an older default
- A boot-time failure (not an in-session crash) usually points here before anything else
2. Large or complex ships overloading the physics tick
Valkyrien Skies ship-physics calculations add real, ongoing tick cost, and that cost grows with ship size and complexity rather than staying flat like typical entity AI. This is a pattern specific to physics-simulation mods like VS2, not something you'd see in a standard Forge tech pack. A single large warship — especially one loaded with weapon addons and moving parts — can start dragging down server tick time well before player count or world size would normally be a concern.
If crashes or severe lag correlate with a specific ship being active rather than general playtime or player count, this is the most likely explanation.
3. Less-tested mod-specific edge cases
Because The Adventure of Valkyriens is built around a specialized physics-engine mod rather than mainstream, widely-used Forge mods, it generally sees less community testing overall, so mod-specific bugs can surface as crashes somewhat more often than in a typical tech or kitchen-sink pack. If you've ruled out Java version and ship-physics load, check the crash log for stack traces pointing into VS2 or its addons specifically — that narrows down whether you're hitting a known issue with a particular ship mechanic or weapon system versus a general server problem.
4. Addon conflicts and config corruption
Ship-combat packs like this one typically layer several addons on top of the core physics mod to add weapons and ship systems. When multiple addons interact — especially around collision detection or weapon-firing logic on moving ships — that's a more plausible source of instability than a single isolated mod. If crashes started after an update to one of these addons, or after a world was edited outside the server (ship data corrupted by a bad save or an interrupted shutdown), check there before assuming it's a core physics issue.
5. RAM under the pack's realistic floor
The real floor for The Adventure of Valkyriens is 7 GB. Running under that floor doesn't always produce a clean, instant crash — more often it shows up as cascading lag and garbage-collection pauses during heavy ship combat or large builds, which then cause a tick to time out and the server to go down. If your crashes cluster around combat scenes or big ship maneuvers rather than happening randomly, check your allocated RAM against this 7 GB floor before assuming it's purely a mod bug.
FAQ
Why does my server crash more when players build bigger ships?+
The Adventure of Valkyriens is built around Valkyrien Skies 2, a physics-simulation mod, and ship-physics calculations scale with ship size and complexity. A small scout ship costs almost nothing per tick, but a large warship with many blocks, weapon addons, and moving parts adds real tick cost. If crashes or freezes line up with a specific player's megaship rather than general playtime, the physics load from that ship is the most likely cause — try asking the player to temporarily disassemble or simplify it as a test.
Is this a 'my server is misconfigured' problem or a mod bug?+
Could be either, so rule out configuration first. Forge 1.20.1 requires Java 17 — if the server won't boot at all (rather than crashing mid-session), check the Java version before anything else. If the server boots fine and only crashes during active ship combat or heavy building, that points more toward VS2 and its addons hitting an edge case under load rather than a basic setup mistake.
How much RAM does The Adventure of Valkyriens actually need?+
The real floor for this pack is 7 GB. Because it leans on a physics engine rather than typical entity-heavy tech mods, running under that floor doesn't always produce an instant crash — it more often shows up as creeping lag and GC pauses during ship combat that eventually time out a tick and bring the server down. If you're seeing crashes specifically during combat or large builds, check your allocated RAM against this floor before digging into mod-specific causes.
Host The Adventure of Valkyriens on hardware sized for its real floor
The Adventure of Valkyriens needs a real 7 GB floor to handle ship-physics load without tipping into GC-pause crashes — pair that with a backup before any risky ship or addon change so a bad save never costs you a world.
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