A seraph is a a kind of elemental spirit, in that they're not humans. They're people but humans can't see or hear seraphim, so it's hard to communicate.
If someone who has resonance can form a pact with a seraph, they can use their powers and even use their own resonance to help other humans see seraphim, though they'd have to get pretty strong for that to work.
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If someone who has resonance can form a pact with a seraph, they can use their powers and even use their own resonance to help other humans see seraphim, though they'd have to get pretty strong for that to work.