Achens.
It is one of the earliest cities that founded itself in Pandemonium.
To establish a city in Pandemonium one had to register with the Centre Region where many world famous people under Death Monarch gather and also the centre of power in Pandemonium.
They also need to prove they have the capabilities to safeguard their citizens. Then they also need to prove their eligibility.
They must have at least had five Energy Disperse Stage High Realm experts or three Energy Disperse Stage pinnacle realm experts
The Centre Region also did not lose out on this. It was like they were leasing lands.
The Centre Region would only take thirty percent of the profit of the city and anyone that dares skimp on payment would have their cities sacked the people in power executed and expelled from Pandemonium