Give players rewards from breaking chests.
Download the jar from Releases OR compile it yourself. Instructions to do so are in Compile header
Drop it into the /extensions folder.
Create a folder, then Clone the repository using:
git clone https://github.com/Project-Cepi/LootboxExtension.git
Once it is cloned, make sure you have gradle installed, and run
./gradlew build on Mac or Linux, and
gradlew build on Windows.
This will output the jar to build/libs in the project directory.