From Kingdom Hearts Wiki: A world of information not accessible by Gummiship
Ancient Light (エンシェントブライト, Enshiento Buraito?, lit. "Ancient Bright") is an ability in Kingdom Hearts III. It allows the user to annihilate surrounding enemies with five columns of crisscrossing light.
In Kingdom Hearts III, Ancient Light is an action ability. It serves as the third-level finish command of Second Form S. Its damage is determined by Sora's Magic stat.
Learning Ancient Light
Kingdom Hearts III