The Kingdom of Faruosa , the neighbouring kingdom whose three- fourths of borders are covered by the sea. In terms of area, it is very small but has a strong naval base. Also, due to the presence of natural ports and harbours, it became an international hub for trade. Since it had a small number of nobles, the kingdom in itself was quite harmonious. There was no unnecessary power struggle and they worked united to become wealthier.
The prime reason why it was said that the Nightmare guild had entered the golden age with ' Worst Nightmare- Cahill ' as its guild master was because they managed to successfully assassinate the king during his sleep despite 500 guards on duty and a top tier magic security system. Rather than an assassination, it should have been called a massacre. Cahill pulled this feat all alone.
No one realised people had died until the next morning when the maids woke up.