SuperiorSkyblock provides a powerful API, so you can make your own custom modules to the plugin, change behavior of the plugin, register custom commands and more! You can find the javadocs of the API here.
SuperiorPlayer This object is used as a warpper to the known player objects of the Bukkit's API. It contains data about the player, states of modes (fly mode etc) and more. You can retrieve the object using
SuperiorSkyblockAPI.getPlayer(<UUID>). Island This object is used to cache data about the islands on your server. Members, banned list, multipliers, upgrades and all of the other data is stored in this object. You can get the Island of a player by using
SuperiorPlayer#getIsland(). If you want to get an Island in a specific location, you can use
SuperiorSkyblockAPI.getGrid().getIslandAt(<Location>). GridManager The grid manager object handles all the islands on your server. If you want to interact with islands, get them from the top list or anything related to that, you should use this object.