In his impatience to start exploring, Finn touched his hand to the glowing red rune. Touching it seemed to do nothing at first, but after a few seconds a deep rumbling sound came from inside the wall. A large square chunk of the wall, about six feet wide, began sliding upwards, opening up a hidden passage. The wall showed to be several feet thick, made of solid grey stone. The moving stone slab came to a stop after a few seconds, leaving an eight foot tall doorway. On the other side was a dimly lit hall, roughly 50 by 25 feet in size with a high ceiling. The only source of light was a few burning torches hanging on the wall about 12 feet high, just like the first room. The ground was dusty and scattered with tiny pieces of rubble, mostly chips of wood and stone.
Near the far end of the hall, three humanoid creatures were standing around idly, staring at the ground. They were all skin and bones, like a man who hasn't eaten for weeks, and their skin was discolored and putrid-looking. They wore the tattered remains of what was once cloth and leather clothing. Their eyes were red and bloodshot, with a wide unfocused gaze. They were ferals: men who had long ago lost their sanity and now served as an extra danger to anyone trying to traverse the dungeon. The man most to the left carried an old shortsword, rusty and battered, but still fairly dangerous against unprotected flesh. The middle man carried an iron hatchet, in a similar unmaintained state. The right one carried only a ten-inch-long dagger, old and rusted like the rest.
There was a fourth creature standing in a far corner, facing the wall. He wore a tattered brown cloak and a nearly complete set of old iron armor, so rusted and dented that it must've been many years old. The visor of his helmet was up, revealing the same gaunt discolored face as the others. In his right hand he held a longsword, old and battered, but in slightly better condition than the others' weapons. Strapped to his left arm was a large wooden kite shield with a rusted iron rim.
As the door opened, all four men raised their heads and turned towards the door. “Others. Enemies.” croaked the leftmost man in a strained voice. “Kill to live. Kill to live.” mumbled the knight in the back as he raised his longsword and shield into fighting stance and began slowly approaching the newcomers. Despite being poorly armed, the other three were less cautious. They ran forward with an awkward ape-like gait, the sword-wielder going left and the dagger-wielder going right in order to circle the newly opened doorway. A few paces from the doorway, they stopped. The middle one, with the hatchet, showed a terrible grin full of missing teeth. "Come on in, new ones. We won't hurt you very much." he spoke, followed by a cackling chuckle, while he waved his hatchet around menacingly.
Just then, with a deep rumble, another stone doorway slid open in the middle of the hall's western wall. The three lesser ferals barely seemed to notice, but the armored one turned towards the newly opened passage with his weapons raised and looked at the single humanoid figure that stood on the other side. "Who goes there?" the knight croaked. "Show your face, so i can cleave it!"