Thunder Fortress.
There was a place in the Sixth Floor of Tong Tian Tower that could induce fear in a person just by hearing its name— the Thunder Fortress.
Despite its name, it was not a castle or fortress, but a kingdom.
More accurately speaking, it was a robbers' den.
Rumor has it that in the whole of Tong Tian Tower, a unique type of 'Thunder Ore' could only be found there, hence, the adventurers who camped there in the early days named it the Thunder Fortress. Of course, there was another version saying that as the surname of the adventurers' leader was Lei, he named the place the Thunder Fortress, and the ore indigenous to the Thunder Fortress as the 'Thunder Ore'.
(want2eat: Lei is thunder in Chinese)
Whatever the truth was, people didn't really care.
Also, as the Thunder Fortress had been dominated by the Dragon Hunters for thousands of years, it became a restricted ground for normal adventurers.
