It seems it's really not under the ancient castle.
So Fang Hong sent a message using his own communication crystal.
Since communication is normal, but he can't reach his own people, most likely something has happened. However, as long as there is Starlight, revival is quick for the Eteliria people after death, and communication interruptions have many possibilities.
He thought of one among them.
Fang Hong held the crystal and raised his head: "How far is it from where you came in? Are there any forks in the middle? How's the situation outside? Which direction is the entrance in the valley?"
The few people exchanged glances.
"What does this have to do with it..." asked the Imperial Guard Swordsman.
"Of course it does."
"About five or six minutes roughly, no forks in the middle, the mine tunnel slopes downward..."
"Mine tunnel?"
"...Outside is an abandoned mine, south of Aimumu Fortress... We investigated before coming, that's how we knew about this place..."