An Arch Demon is an enemy first encountered in the circle of Violence. They are the third choir of fallen angels, and among the original fallen. They resemble winged versions of the Guardian Demons armed with a pair of swords.
The first objective in killing an Arch Demon is to get them down to the ground. Block their aerial strikes, and dodge the ice blasts after they flap their wings (If you are struck, you will have to repeatedly press circle/B to escape). They will also dive down in an attempt to charge the player, which can be blocked or dodged. While its vulnerable, strike with several quick scythe attacks and follow up with cross attacks while in the air. Once prompted, the player has the opportunity to use a grab move, slicing it's wings off. This must be done in order to punish/absolve them, otherwise they will normally die after sustaining sufficient damage.