time for some good ol' Psychometry!
Let's try to sense the cat ourselves, but have our spirit look around on its own as well.
Time for some good ol' psychometry! You place your hand on the child's head and close your eyes, tracing the path his aura had made throughout the area.
You can see where people had walked through the alley, including the child. If his cat has been around him for extended periods of time, there would be some cross-contamination that you could use to your advantage. After a moment, you isolate what you believe to be his cat's aura and sic Harl on it.
Harl always got along well with cats. You suspect it's because he has the same mix of egotism, sadism, and good intentions as felines do.
You make a show of searching around with the boy while waiting for Harl to return. After fifteen minutes, a scruffy, yellowish-brown cat trots into the alley and purrs loudly as it rubs itself along the child's legs. Invisible to the naked eye, Harl slinks out of the cat and back to you as the boy scoops up the cat, which continues purring loudly.
You mentally add divination to your list of things you are the best at.
Skills:
Sense Motive: 6/10
Illusion: 10/10
Divination: 6/10
Inventory:
50 coins
Silver necklace - "This necklace bears your family's crest, a stylized depiction of a solar eclipse. The reminder makes you a little sad, but you keep the necklace anyway."
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