Maintaining precise control over the alchemy furnace's heat at every single moment to ensure not the slightest deviation.
In addition, there was the prior processing of the medicinal properties, repeatedly flushing them with his own spiritual qi, along with the neutralization and purification among various different herbs.
Every step was exceedingly tedious, demanding extremely high patience and concentration, while the requirements for spiritual power and technique were even greater. No wonder Yang Meng was utterly incapable of achieving this.
Chapter 352