My System Comes With Marvel Technology

The world's populace was on edge due to the God Devil Continent's abrupt entrance! 
The leaders of the various nations were prepared for battle!
Why!? because it established a battle for survival in which a contestant from each nation would be chosen at random and given a castle to rule over, guard, and develop. 
Even if the players' exploration-based resources would be represented in the actual world with a 100 times boost in power, any harm done to their castles would also be 100 times worse than it would be there! 
Additionally, if a contestant's Castle Heart was broken, they would be pronounced dead and their nation would suffer punishment a thousand times!
Additionally, the nation from which the competitor perished might send out a fresh contestant until the nation was obliterated! 
They were even more frightened by it!
But they were enlightened when one enigmatic individual called "Tang Xiaofan" showed up there! 
They originally believed that God Devil Continent was a global crisis, but they now realize that it was actually an unprecedented opportunity!