They don't have...resonance; spirit sense. Sorey does since he was raised as a baby by seraphim, Alisha does since she made a pact with him before, and Rose does since...well, she got influenced by a seraphim for a long time, too, but it took a while for her resonance to trigger. We don't really know what the key to increasing it in the general population might be, though. Sorey can't just pact with every single human we meet.
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