The devouring lily cauldron phantom spider was a meticulous creature. It didn't just choose its victims randomly. With its exceptional camouflaging abilities, it would stalk potential hosts for years before settling on one. This caution stemmed from the fact that, just as the transformation process is nearly impossible to halt once it begins, the spider itself was bound by the same restrictions.
Once it activates its innate ability to overdraw a host's latent potential, it cannot leave the host's body or stop the process. A crucial part of creating the tonic it needs involves blending its essence with that of the host until the two resonate and become indistinguishable.