Gilvaroth

 is the final boss of the Jeanne D'Arc (Game).

History
Prior to the series, the English Empire had been controlled by the demonic forces and led by an ancient powerful demon, and leader of the reapers. Gilvaroth possessed Henry VI through a dark ritual made by Bedford, the king's uncle and strategist, and one of armlet wearers. There are 4 Reapers which possessed Duke of Burgundy or Philip, Roger, Georges; Charles' assistant, and Queen Isabeau, Charles' mother and former queen. However, they all get absorbed by Henry VI.