The level up bar shows the amount of XP you have at the moment. You can gain XP by killing other players or mobs, farming, smelting ores, mining on ores, breaking mob spawn blocks or sleeping.
Appearance[]
The level up bar is a dark blue rectangle with a green outline. There is a 4-sided star with the current levels of XP you currently have at the left of the bar.
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A Level Up Bar Showing at 2 Levels
Mechanics[]
When you die, you will lose exactly half of your XP levels. When you kill someone, your level up bar increases by the amount they lost (half of their XP). If they do not have any Aura XP, you will receive 1 Aura XP level. For every Aura XP level increased, stars appear around the level you are currently in representing celebration for passing a level and a sound is played. The maximum number of XP levels you can have at any time is 300 levels, even though this number can be changed by code blocks.
The diamond enchanting table
You can use Aura XP levels to enchant items using an Enchanting Table. This will upgrade the items to give you boosts when using them.