The next part of the yellow-colored stone construction built to seal the demon in the Alchemaze wasn't as symbolic as an arrangement of dead knights. It was simply massive slabs of the yellow-colored, demon-suppressing stone creating a large cube in the middle of a grand hall.
Karandiel shed light upon the hall, illuminating the cube with all its inscriptions and the walls with their paintings. By piecing together everything in the room, Ackster and the others quickly realized that the demon was sealed inside the stone.
The inscriptions had lost their effect, if they had any from the beginning, as was evidenced by the stone being almost pitch black instead of the clear yellow color it was originally. But the cube was still intact, and there were a few hues left before miasma completely overtook the stone.