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After all, Core Formation isn't just a 'bo' and it's done; you think this is a hen laying eggs?
For cultivators, Foundation Establishment and Core Formation is an important process for laying the foundation. A skyscraper cannot be built from the ground up overnight, especially when the Blood Talisman Divine Sect's techniques are so distinctive.
Although the usual cultivation is indeed very rapid, the transition from 'Wait till I master the Divine Skill and I'll come out and kill you all!' to 'I have finally achieved mastery of the Divine Skill!' tends to be relatively slow. Sometimes, one has to be in closed-door training for a long time, and it's possible that by the time you come out, your enemies are already dead from old age...
However, based on Li Pan's estimate, Li Xuehong's progress was actually quite fast, and it should be no problem achieving the Divine Skill tonight.
