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How to get an ItemsAdder item using ItemBridge
To get a custom item using Mimic you have to use this command:
/ib get ia:<item namespaced id>
/ib give <player> ia:<item namespaced id>
/ib drop <world> <x> <y> <z> ia:<item namespaced id> [amount]
Example
/ib give LoneDev ia:itemsadder:ruby_sword