Copper: A Taste of Heaven is the seventh Secret Mission in DmC: Devil May Cry, located in Mission 8: Eyeless. In this, Dante must defeat 3 Shielded Pathos and 7 Death Knights without getting hit as it will mean instant defeat. However, since the enemies also die in one hit, it is useful to use attacks that have area of effect.
Dante must first defeat the Shielded Pathos as they can attack from a distance with their crossbow. After they have been defeated, Dante should use Eryx's Stomp (while mid-air, press+/+) to immediately defeat any surrounding Death Knights. Defeat the remaining Death Knights by breaking their shields and hitting them with any attack.