Hello! huge update. This is now compatible with the latest version of minecraft, I've changed the bosses format to be more similar to Superheroes with the names at the root level and it now requires the latest version of SkillsLibrary.
/boss spawn now supports spawning a boss at another player, at a location in the same world as the sender of the command and at a location in a world of your choice.
Added some configurable messages to boss spawn although these have not been rolled out generally