There were special tokens that were held by the four family patriarchs to open the barrier for a short period of time if it was necessary. After all, these four people were the few magic warriors who held the highest fighting power in Wansu City.
So if there were any emergency, they could get out of the city quickly.
There should only be four copies.
But the Black Family and the White Family were a bit special. There were more than one most powerful magic warriors in the past, so Black Family Patriarch's brother and the White Family Patriarch's brother both have another copy.
The White Family Patriarch's brother naturally kept his token in his hand.
But for the Black Family…
"Silas's mother," the Black Family Patriarch murmured.
After the death of his brother, he forgot to search for that token and the last time, that token was still in Silas's mother's hand.