you work on a ranch

One day you are walking up the stairs, heading to your room after playing games of pain in honor of the harvest moon festival in hell. You went to the 2nd floor and you see... you see a strange light from the room of Striker, the demon with whom you work together. You go into his room, there is no one there except for the case... a case with a blessed sacred craft weapon made from melted down angelic mines, capable of killing any demon