Originally posted by TheBoot:

Originally posted by PakaNoHida:

If they make it bigger than it is it will destroy some worlds.

I don't know just how close you can build to them. Moving the stones outward, it wouldn't take much movement to make space for an eighth stone. I think there's already enough for seven.

The stones currently fill a 10 meter radius and the no-build zone extends an additional 15 meters beyond that. As long as you didn't use mods to fill in that space, then there is far more than enough space to enlarge the circle to accomodate a boss for every biome in the game.