Overview

xLimbo is a rock-solid fallback / limbo server plugin for Paper (Pufferfish) networks. When your main server crashes, restarts or becomes unreachable, players routed to xLimbo land in an empty void world — creative mode, flight enabled, on an unbreakable glass floor — so they stay connected to the network instead of being disconnected. When the main server is back, they hop straight over with /join (or automatically).

Built to never go down

Every code path fails safe. xLimbo never throws out of enable/reload, never blocks the main thread, never disables itself on a bad config value, and no single player action can lag, crash, grief or escape the sandbox.

How it works

• Void world owned by the plugin — an ultra-cheap generator (one shared glass-floor layer per chunk; caves, decorations, structures, mobs and noise all disabled). Ephemeral: autosave off, spawn chunks not kept loaded.
• Join flow — players are put in creative + flight and async-teleported to a bounded, spread-out random spawn (the chunk is preloaded first, so the join tick never blocks on generation). A world border bounds all roaming and caps total chunk generation.
• /join — sends the player to the main server via the proxy (BungeeCord Connect message), with configurable aliases, permission and a per-player cooldown to stop proxy spam.

Requirements

• Paper (or a fork like Pufferfish) 1.18.2 or newer — the oldest release that provides everything xLimbo needs (modern ChunkGenerator hooks + BiomeProvider, bundled MiniMessage) without shading extra libraries. A jar built against 1.18.2 runs on all newer versions.
• Java 21 runtime.

Next steps

• Configuration — install, config, and reload semantics.
• Protection — the exploit-resistance toggles.

Links

• Source — github.com/xena-studios/xlimbo
• Downloads — Modrinth · Releases
• License — GPL-3.0