Chapter 226 : Ice Extinguishes Fire

"You know, Arthur, parasites are metabolically dependant despite needing to rely on a host. If it were the you from the beginning, before any evolution, then surviving in real form for a few days is possible, but it's impossible to live without the need to feed on any kind of host, generally humans.

If you can master your racial abilities, no one can resist your possessing, you can easily product resistant forms to resist any future defense or resistance coming from within the host.