After returning from the Small Cold Realm, Zhang Yan did not waste any time and picked up the "Nine Numbers True Scripture" again. Based on his own comprehension, combined with the insights of many predecessors, he finally clarified his thoughts and roughly understood how to use this scripture to derive cultivation techniques and transform into the Miao Dao.
This scripture cannot be used arbitrarily during practice; it requires consuming a large amount of Elixir Evil. The longer the derivation process lasts, the more Elixir Evil it consumes.
Many cultivators, when halfway through the derivation, are forced to interrupt due to insufficient Elixir Evil. They must adjust their breathing and recover their Primordial Qi before starting over, making all their prior efforts futile.
This has driven many to greatly shorten the derivation time, but as a result, the outcome often falls far short of their expectations and deviates significantly from what they hope to achieve.
