Somehow i missed this, so i apologize for the late response. The whole world boss thing could be taken down with a minimum of 3 Guardians, the whole point is to get as many Guardians in the area working together in one area against a common foe. The less guardians you have the harder it is, You could in theory solo one, but it would take a very long time, and death would of a single player would reset its health back to full. And i like your ideas, they would be great for higher level patrols, as it would provide a good place for those to happen. Mainly because imagine a low level would get creamed by something like that.