C173 With the existence of the Fortress of Resilience the human race could still survive

Ten thousand miles away from the floating island, at the Fortress of Resilience.

The Fortress of Resilience was a tough defensive zone built by the humankind, and there were tens of thousands of attacking magic formations there.

But of course, because the human race had to endure the invasion of virtually all alien Outsiders, they didn't have any heartforce to attack them.

Therefore