Necessarius

The Church of Necessary Evil or Necessarius (必要悪の教会ネセサリウス Hitsuyōaku no Kyōkai (Nesesariusu)?, lit. "Church of NecessaryEvil") is an international security organization and is the main protagonist faction of the A Certain Magican Index series. It is the 0th Parish of the English Puritan Church and serves on its behalf with the intent of supressing the presence of magicians and magic all throughout the United Kingdom. Necessarius Members make up the majority of Touma Kamijou's allies.