User blog comment:Nekokokokoko/Slane Theocracy's awareness of Ainz/@comment-26932361-20150920140152

They knew that he was dangerous because of the Sunlight Scripture being eradicated, as for how they knew about him; it is actually very simple, Ainz let some of the fake knights that attacked Carne Village return alive and report the warning that he told them and he also told them his name so that's how they knew.