This subspecies of Metal King is said to hold within its large body a huge collection of information on the element of light. They are referred to as "Metal Heroes" in collective research documents relating to the metal record species. What exactly the Metal Kings did to become known as heroes is unrecorded, but it seems everyone around them finds what they say somehow fascinating.
Light King is best used as an ingredient for fusion, providing a base of 11,012 XP. When fused with Light element units, it grants 16,518 XP, not including Great Success (x1.5) or Super Success (x2). The Light King only sells for 2,500 Zel.