When Levi was inside the Sacred Pool, he slightly gained insights into the cultivator's law; however, before he could completely grasp the cultivator's law, he was kicked out of the Sacred Pool.
So, without a choice, he hurriedly rushed towards his master to inform him about the cultivator's law.
As a peak elite general realm cultivator, Master Elek knew the advantage of learning the cultivator's law at a young age. So, he took him to private cultivation chambers which provide the cultivation boost ranging from 2x to 5x.
However, to take a 5x boost cultivation chamber would cost a fortune.
Nevertheless, Master Elek didn't hesitate to spend that much because it would fasten the speed in learning the cultivator's law.
As for the name of the 'Private cultivation chambers' name, it was "Heavenly Cultivation Enhancement Hall". It was owned by the Protector Olek and managed by his servant whose cultivation was unknown.