Due to his background in microbiology research in his past life, Kain didn't throw the word "immunity" around lightly.
So when Bea used it—when she said the ancient contract was developing an immunity—he froze.
Not because the word was unfamiliar.
But because he understood exactly what it implied.
In this world, the average spiritual creature and person's body wasn't built with disease in mind. Spiritual strength, fortified bones, enhanced recovery rates—sure. But immune systems? Bacterial defence? The concept of microbial warfare had almost gone extinct. Why? Because illnesses had. Or at least, the ones that used to cull millions of lives back on Earth.
