A Certain Magical Index Season 1 Episode 2

Innocentius (The Witch Hunter King)

The magician reveal himself as Stiyl Magnus and explain that his partner Kaori unintentionally hurt Index as her Magical garb was suppose to stop the blow and his mission to 'protect' Index or actually the Index-Librorum-Prohibitorum, the 103,000 books implanted in her mind as she possess photographic memory. Toma, angered by Stiyl's ill treatment of Index attacks him and he counterattack by using Fire magic but is surprised when Toma nullify s the spell. Styil then summons a fire creature named Innocentius which Toma can't stop as the creature keeps regenerating itself from his attacks. It is only when Index other personality, John's pen mode, reveals the creatures powers comes from Runes place around the building that Toma is able improvise and defeat Innocentius and Stiyl using the sprinklers to destroy the Runes as they were on paper and rescue Index.