XP Level Border Multiplayer

Initial stable release

• LevelBorder system for multiplayer worlds
• Border grows based on combined player levels
• 1 block per level → 0.5 blocks in every direction
• Does not shrink on death or enchanting
• Border only grows after previous highest total level is reached
• Works smoothly with player join/leave
• Displays player levels in the tab list
• Fully compatible with vanilla singleplayer & multiplayer