Right as everyone present marched onto the mountain which was in the shape indicated to them, they all disappeared.
The first thing that all of the sovereigns felt after finding their footing was that a very loud sound was coming from somewhere near them.
They had to take a few moments to allow their vision to adjust, and after that, they all saw that all 208 of them had been teleported into a large cave, resulting in them having to crowd together and lose the formation that they had carefully assembled before entering.