FlexBorder

This mod is a reimagining of my old mod Border like Battle Royale

What This Mod Adds

This mod adds a single, powerful command:

/flexborder

All setup and control is done through its subcommands.

🧭 Features

• 📦 Asymmetric rectangular border (any X/Z coordinates)
• 🔄 Smooth animation of shrinking or repositioning
• 🧲 Soft pushing toward the safe zone when slightly outside
• 🕳️ "Rescue" teleportation with dark screen + impulse if far away
• 🩸 Health penalty system that reduces max HP on each death (down to 1 HP), like a Mediumcore mod
• 🕒 Configurable development phase (safe exploration period)
• 🏁 Built-in Battle Royale mode: automatic shrinking with pause phases
• 🔃 Fully resyncs on player join or dimension switch
• ✅ Persistent state (saved in world data)
• Translation to hardcore in "battle mode"

Command Reference

/flexborder set <x1> <z1> <x2> <z2> [dimension]

Set the rectangular border in the given dimension (or current one).
Coordinates define the opposite corners.

/flexborder get [dimension]

Display current border settings.

/flexborder dev <duration> <shrinkDistance> <shrinkTime> <pauseTime> <minSize>

Start a development phase for the given number of seconds.
During this phase:

• Players lose max HP on death (but stay alive)
• Border stays still

When time is up, Battle Royale mode starts automatically.

🧪 Example: /flexborder dev 300 10 15 10 50

→ Wait 5 minutes, then start shrinking every 10 blocks, taking 15s per step, with 10s pauses, until the zone is 100×100 (minSize=50).

/flexborder brstart <shrinkDistance> <shrinkTime> <pauseTime> <minSize>

Start shrinking the border in steps:

• Shrinks by shrinkDistance (on both X and Z)
• Takes shrinkTime seconds per step
• Waits pauseTime seconds between steps
• Stops when either half-size reaches minSize

Example:

/flexborder brstart 5 10 10 50

/flexborder brstop

Stop any ongoing shrinking animation.

/flexborder hploss <amount>

Set how much maximum HP is lost per death during development phase.
HP never goes below 1 HP and never reduces more than 20 total HP.

Example:

/flexborder hploss 2.0

Each death removes 2.0 max HP from the player.

/flexborder hpreset [targets]

Reset max HP penalty. Restores players' original HP cap.
Heals players by the lost amount (but not above new max).

If no targets specified, resets for command sender.

Examples:

/flexborder hpreset
/flexborder hpreset @a

🔒 Permissions

All /flexborder subcommands require level 4 permission (admin by default).
Only the command sender sees any messages in chat.

📌 Requirements

• 📦 NeoForge 21.1.200+
• ⚙️ Must be installed on both client and server (for rendering + logic)
• 🧠 No mixins, cleanly integrated via event hooks
• 💾 Border data saved per-dimension (via world capabilities)
• Completely removes vanilla worldborder, do not use with mods that change worldborder

💡 Use Cases

• Hardcore survival servers with soft boundaries
• Battle Royale gamemodes
• PvP arenas with dynamic safe zones
• RPG maps with exploration followed by collapse