The fastest way to reach Britannia without the aid of any artifact was by airship. However, airships were prohibitively expensive, even for the wealthiest members of society. They were a symbol of opulence, a means for the elite to flaunt their immense wealth. Simply boarding one was enough to announce your status to the world.
The reason for their exorbitant cost lay in the fuel source. While mana stones were plentiful enough to power everyday vehicles like cars, they were insufficient for something as sophisticated as an airship. Instead, these majestic vessels required Black Stones—a rare and costly resource. Only royalty and the highest-ranking nobles could afford the luxury of using Black Stones for frequent travel.