Angel had indeed seen oil paintings in the Stairway of the Hanging Prison within the Nightmare Realm. But all of those paintings had been gathered on the very top floor—the warden's residence.
The warden of the Stairway of the Hanging Prison seemed to be someone who dearly loved oil paintings. Every corridor of his residence was filled with artworks, and every single one was a masterpiece by a renowned artist.
When Angel had left the Stairway of the Hanging Prison, he had even picked two paintings from the warden's gallery and brought them back to reality.
Those two paintings were still lying in Angel's bracelet to this day.
The oil painting on the wall of the ruins was naturally not one of the two Angel had brought out, but he had seen similar paintings in the warden's gallery.
In other words, this painting had most likely come from the warden's gallery at the very top of the Stairway of the Hanging Prison.
But how had it gotten here from the warden's gallery? Had a void storm scattered the paintings inside, and this one happened to fall here? Or was this entire wall actually part of the warden's gallery back then?
After thinking for a moment, Angel walked toward the painting.
Before he even reached it, Angel had determined that this wall had not come from the warden's gallery. It had originally belonged to a prison cell on the second floor. The gallery's walls were made from the same material as the frames: precious lacquered wood. The only difference was that the walls were covered in dark purple matte wallpaper.
The wall in these ruins, however, was made from a mixture of stone and wood. It was a relatively cheap material, even cheaper than the Deepsea Wood from before. Its only