As the group ventured through the red portal, they found themselves transported to a vast and ominous chamber. The air was thick with tension as they surveyed their surroundings, but it was completely empty.
All fifty adventurers were teleported to a big room, and right as they all entered the red portal, a panel appeared in the middle of the room, where everybody could see.
[Teleporting to the tenth floor (boss stage) in ten seconds, be ready]
There were too many of them in numbers, so the dungeon probably adjusted and planned to teleport them to different locations in the boss chamber.
The countdown on the panel began, and the adventurers braced themselves for what awaited them in the boss stage. Ten seconds felt like an eternity as they exchanged nervous glances and tightened their grip on their weapons. Each of them was acutely aware of the danger that lay ahead, but they were determined to see this through to the end.