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“Shadow initially seemed unaffected when I placed the thing around his neck. He has worn collars before, both the ordinary and faerie-made variety. But as we walked, his lumbering gait grew more graceful, and he paused frequently to sniff at things.
"What does it do?" Rose enquired.
"It's hobgoblin-made," I said. "They sometimes keep grims as guard dogs. The legend associated with it suggests that it will enhance Shadow's speed and senses.”