King Castle appears in the first World of Magatsu Mandala within the Midnight Channel. It is a shadow that attacks using only Physical skills. King Castle is Weak to Light and Darkness skills and takes 50% more damage from Fire, Ice, Electricity, and Wind skills. After being defeated, it may drop a Snow Stone. Selling 4 Snow Stones will unlock the Hero Legs for Chie Satonaka in the shop.
In Golden, King Castle appears in Magatsu Mandala Worlds 1 to 3. It is solely a physical attacker, protecting its weakness with Dodge Fire, and can increase its critical rate using Rebellion. It may drop Rainbow Quartz for trade at Shiroku Pub.