```
The catalyst was his blood, having ingested two extreme immortal grasses before.
The medicinal effects of the two immortal grasses had long since completely integrated within Tang San's body, and his blood was undoubtedly the best catalyst. Slightly cutting open his wrist, he knew that even the slightest abnormal noise on his side would awaken his father.
To prevent the blood's scent from spreading, he even silently activated the Bluesilver Field to cover it up.
The fresh blood, like meandering little snakes, dripped into the cauldron. Fearing the medicinal effects might be insufficient, Tang San let the blood flow until he started to feel dizzy before stopping. He pressed quickly down on the wound.
