Answers

An unstoppable tide was sweeping across the Crystal realm, targeting those lands owned by the nations as well as those farther, disconnected lands held by mere nobles or less powerful races. There was no forewarning for this attack, nor had there been such a massive invading force of Kraven ever before.

The number of immortals deployed was far beyond a number that any one nation could employ. Perhaps if multiple nations worked together, they could muster up the number of immortals required to fight off the force invading a single one of them. Yet, as things stood, there seemed to be little to no recourse.

The only remaining advantage they had was that the Crystal realm was so ridiculously vast, it would take even immortals a lot of time to traverse if they were not taking teleportation formations. Moreover, since the force was invading, they had to ensure they thoroughly swept each and every spot, so not only did they move slowly, they could not utilize teleportation formations.