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[Bug?] Gullykin Halfling (Spoiler)
In one of the homes in Gullykin, you encounter a halfling with a few dialogue choices. If you kill this halfling he has two slings in his inventory (one magical, one normal). Not sure why he'd have two.. but hey. If you charm him, he speaks of giving you something that "may not look like much, but trust him its helped him a great deal". He then gives you the normal sling, keeping the magical.
I would think that based on the dialogue, he'd give you the +1 sling. Just a thought. Not sure why he even has two slings?