Super Magic Empire

I can't stand it anymore... I said earlier that it would take a hundred years for the tide of darkness to come. But as soon as the protagonist got the inheritance, dark creatures appeared immediately. So why didn't they appear before? Although some seemed to have appeared for a long time, there was no sign before. As soon as the protagonist came, they all came out. There are still some problems that I won't talk about. It's uncomfortable to watch...