It is an attribute that is energy. It is very powerful and gives bakugan real good strength. It is revealed that Light Duark is really a Ki-Darkus hybrid instead of Haos-Darkus hybrid. The main color is gold and the secondary color is silver.
Ki is a lightning-energy attribute. Some say it is the element of peace and harmony. Some say it is the element of death. Others say it's the "reality-warping" element.