Ok, I have seen a video similar to this idea;
1. Vertx would have to make a public broadcast to notify everyone
2. To do so, he'd have to install a mod that registers players within an area
3. Like it says, the players mustn't disconnect or die, if they do they lose and there is no absolute way to join back or get a second try
4. vertx could do some trials to eliminate players faster, but not all the time, he could just go afk ramdomly.While that happens, players can risk going afk or stay connected
5. To win you must be the only player
I could give you the video if you're confused