Gold Crystal is the source of the Gold Third's power. It is housed in the Golden Summits.
The Gold Crystal converts faith gathered by the Golden Summits into energy usable by the Gold Third. It is said to be on par or stronger than a share crystal. It can be combined with a share crystal to create a Hyper Share Crystal.
Despite being the source of the Gold Third's power, destroying it does not prevent the Gold Third from using their Gold Form. However, it does greatly weaken them.