Party Mod in a nutshell ( vote up so everyone can see ) Party Mod changes the people you play in story mode, ( and also makes it to where you can play any mission in story mode ). For Arena Mode, it makes your character a GOLEM mk.1, and adds new armors ( the full GO3LM set, Phobo's set, etc. ) and guns such as the plasma rifle, and the minigun. They also add the Mega Hammer, for weapons.