You need an Internet connection to initially download content. Once Modern Warfare Remastered has been downloaded, you do not need to be connected to the Internet to play/launch the Single Player Campaign or play Multiplayer locally.

Pack-A-Punch\n\n The first step to getting the Death of Orion Wonder Weapon on IX is activating the Pack-A-Punch. As we detailed in our Pack-A-Punch guide, doing this is a matter of visiting the Altar Room in each of the four towers, hitting the gong there, and then killing the champion that spawns.

The Death of Orion is a wonder weapon featured in Call of Duty: Black Ops 4. It can be found on the map IX.