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BattleGrounds EnergyDrink for MCBE
This plugin uses starvation as energy So you can't use starvation system.

Way to calculation

I will call full energy 20E and full hp 20H
When you have more than 15E, you get 1.5H per seconds. When you have more than 6E, you get 1.0H per seconds. When you have more than 1E, you get 0.5H per seconds.

You consume 1E every 4 seconds. You can get same energy when you eat food.