The Gateway Key is a major tool used in AbyssalCraft. It holds the ability to open portals between The Overworld and The Abyssal Wasteland , but can also be used within The Dreadlands (if you still have one at this point).
Materials used to craft a Gateway Key are the following:
If you right-click on the ground while holding this tool, it will form a portal. This will however not work if the path is too narrow, in which case nothing will happen (which would indicate that it was used at a incorrect location). If you happen to use it in a dimension that isn't the Overworld, the Abyssal Wasteland or the Dreadlands, it will also prompt a message pointing out that it isn't working.