As our group kept moving from the 41st floor upwards, we started getting attacked by the ashen-white devils.
There weren't that many of the ancient devils in general, so it wasn't a big deal for us to keep advancing, even when we kept getting ambushed every few minutes.
The levels that came after the 41st had the same liminal layout, so I kept using fire magic to mark a few arrows on the walls and ground, which led to the staircase going up.
When we arrived on floor 49th, I sent a voice message to the other groups in the levels under us, and I was glad to know that they were also advancing without much resistance.
Once we found the staircase leading to the 50th floor, I gulped in anticipation, knowing that we would officially be halfway done with the tower. Of course, the big challenge was still a long way above us.