Author's note: this is from Aldus's point of view
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From the moment I understood that Serina's emotions are triggering her pheromones which are impacting creatures around her, I was aware that only one person can help: Vesper.
Vesper is a witch who relies on spells, and she has the qualities Serina needs. Vesper can sense other's emotions to the point of experiencing them herself, and she can control the energies of the person she touches.