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ItemBridge

You need ItemsAdder 3.1.0+ and ItemBridge 3.1+.

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
It's important to add ia: in front of the ItemsAdder custom item name or ItemBridge won't recognize it.
In this case itemsadder:ruby_sword must be specified as ia:itemsadder:ruby_sword.