虹のゲオルギウス

Georgius is the top Saint of Index.
In 1945, Georgius and other Saints was sent by Index to Ayamegaoka to eliminate Index's top priority threat, Lieselotte Werckmeister. Her overwhelming power forced him to use the forbidden spell Contract of the Rainbow, which successfully sealed Lieselotte away, but at the cost of Georgius' life. 

11eyes wiki.