The First Grand Elder looked shocked after the revelation from the Sect Master Yun.
And there was a reason for it.
As far as he knew, very few really came down from the upper world. Even cultivators who ascended from this world to the upper world didn't come back to this world unless it was pretty important. And even if they came down, they would leave as soon as possible.
Sect Master Yun had been in the sect for several decades. He joined as an inner disciple and slowly climbed his way through the ranks before becoming an elder and then the Sect Master. No one who came from the upper world would remain so long in this world.
There are several reasons for this as well.
One, the spirit qi in the upper world is more abundant than in this world. This made the cultivation speed there faster than it was in this world. With abundant spirit qi, a cultivator could break through easily as well.