This is a developer API, that aims to help create custom abilities (and more in the future) for the Companions plugin found here - https://www.spigotmc.org/resources/...abilities-eula-compliant-packet-update.68391/
There's a detailed guide on how to use the API here,
https://gitlab.com/Aster0/companions-reborn/-/wikis/SECTION-4/4.1-Developer's-API
This makes it so, developers are able to work with Companions w/o buying the actual plugin.
(This is a plugin API)
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