When Histerion hurled Kyros to the sky, Kyros quickly felt that Histerion's power was forming around him. With his Heart of Brimstone, many rocks and mountains of Brimstone began to surge out. Kyros knew that Histerion transferred the power and was forming within.
Histerion took the lead and clashed with Lanthanou.
With numerous attacks around him, Lanthanou could not sense the darkness that had moved deeper into his dark elemental incarnation.
The power of Mysterion had helped Kyros hide in the initial meteor attack, and he dove in and raced towards the actual form at the darkness's core.
Kyros saw Lanthanou and grabbed his Crown, and activated [Skotos Eis Phos].
BOOM!
Kyros tried to connect himself with the Crown and take the darkness as he caused it all to transform into light.
"AHHH!"
Lanthanou's form and the power source was the crown itself, and it was being directly attacked by Kyros using the element he was weakest against!