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I've heard good things bout that there 'mcMMO' plugin
You can't modify the formula, but you can modify a variable inside the formula to make it exponentially slower or faster.
This looks great, going to test it out now.
The official mcMMO server is now running Hardcore Mode with Vampirism enabled, it included improvements from the 1.3.08 dev versions.
Just a heads up, we're working on finishing 1.3.07 soon which is bringing many critical bug fixes.
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