The milky-white liquid was a new addition to Liam's arsenal, being one of two alchemical products resulting from the toads' secretions.
Still, while the other alchemical product was meant for battle, the milky-white liquid was merely a stimulant, though one powerful enough to be called a poison.
Rachel still hadn't finished learning all about Liam's body. She was also the authority in that project, but he knew plenty about experimental phases.
It would be riskier, but having Rachel start the acupuncture phase would accelerate her growth in her unique art. Liam was willing to pay the price anyway. Welcoming abuse in exchange for strength was the norm in his journey at that point.
Liam also needed Rachel to start with the needles so that he could fine-tune the stimulant. He had to play his part in the experimental project, but only Rachel could tell him in which direction the alchemical product had to evolve.
