"Welcome to the first floor of the Labyrinth of Blood. To leave the labyrinth, you must enter the last room."
Ken heard the same voice welcoming him inside.
"Where is the floor?"
He tried to ask just in case, but as he thought, he didn't get any answer. He walked through the long corridor and used his Blood Sense, trying to find out whether there were any living beings nearby.
To his surprise, he did sense some, but he felt that the walls of the labyrinth blocked his technique, and his senses couldn't go beyond them.
When looking forward, the labyrinth continued for nearly a kilometer before it branched off into two paths. Along the corridor, there were several doors, and Ken assumed that each contained either a treasure or a danger, probably both.