For thousands of years, people knew about the mystic stage. It was talked about in history, the great heroes achieved that stage, and most commonly, Dragons were known to reach that stage at some point in their lives.
So acknowledging the stage was normal, it wasn't anything new. However, that couldn't be the same when it came to a race other than the dragons.
Amber, Ruby, and every single person there were frozen, not from fear, but from the fact that Zaleena was the first non-dragon person in history to achieve the Mystic Stage. But if that wasn't enough, Raven and Ignis, who had recently achieved this stage, showcased their power as well.
Now, everyone felt fear. How could they not? One of their strongest allies, Yole, was a Peak Transcendent with powerful armor and weapons. He honed his skills and abilities to the maximum, and the only way forward would be to break through. Yet, he was killed in one blow, a weak one at that.