Welcome back! I made another command called the PVP Chest. It's more suitable for PVP, not parties. Everything you need is in that chest, no matter what. You can use this feature in one of your adventure maps, PVP games or anything you'd like. I recommend you don't use it for parties. Imagine someone getting terminated by a TNT Apocalypse.
NOTE: You need 1.8 or over to active this command. I recommend you use the version 1.8 in order for the command to work.