Celestial Light Academy indeed had a Plum Blossom Dome and that was an array which practitioners used to train on their movements.
In the array, there were a total of thirty six plum blossom dome poles. It raised high into the sky and each pole was at least ten meters from the ground.
Once the array was activated, each plum blossom dome pole would vary in terms of height as it randomly stretched and shrunk at will.
Those practitioners who were training at this place would be required to be agile and move around these ever-changing plum blossom dome poles, otherwise they would fall down the poles! As time passes, the speed the poles took to contract would increase as the practitioners would require faster reaction time.
The longer one stays in the array, it only meant that one's movements were much better.