[@LeeRoy]

Idea.

What if every season you reveal more of the world. For example, start out with a single continent and have the players fight in and compete over those, then next season unveil another and so on and so forth. Eventually once factions get large enough you could even consider expanding to a solar system that way those characters who indulge in space travel and heavy explosions can explore outside of the rock.

It could also open up opportunities for the world to have a lore of its own with locals who might not be happy to find that their world is suddenly host to a Multiversal Arena that wants to ruin large swaths of land at once.